Hi students, Welcome to **Amans Maths Blogs (AMBiPi)**. In this article, you will get Hard Math Riddles with Answers. You can also download Hard Math Riddles with Answers PDF. Solving hard math riddles puzzles with answers PDF download are brain exercise for school students.

**Read More :** **All Maths Riddles or Puzzles With Answers**

## Hard Math Riddles With Answers

**Hard Math Riddle 1 with Answer** : A grandfather, two fathers and two sons went to visit a zoo in their city and everyone bought one entry ticket each. How many tickets did they buy in total?

**Show/Hide Answer**

3 (the grandfather is also a father and the father is also a son)

**Hard Math Riddle 2 with Answer** : If it took 8 labours 10 hours to build a wall, how long would it take 14 people to build the same wall?

**Show/Hide Answer**

None, because the wall is already built.

**Hard Math Riddle 3 with Answer** : In Akshay’s school time table, Akshay has math 4 times a week. If he has math 8:00 Monday, 9:20 on Tuesday, 10:40 on Wednesday, and 1:20 on Friday, when does Akshay have math on Thursday?

**Show/Hide Answer**

Akshay doesn’t have math on Thursday

**Hard Math Riddle 4 with Answer** : A cell phone and cell charger cost $110 in total. The cell phone costs $100 more than the cell charger. How much was the cell phone?

**Show/Hide Answer**

$105 (not $110)

**Hard Math Riddle 5 with Answer** : James’s farm is selling eggs at 12 cents per dozen. How many eggs can you get for one dollar?

**Show/Hide Answer**

100 eggs. 12 cents per dozen means eggs are being sold for a penny apiece.

**Hard Math Riddle 6 with Answer** : Why was the math book sad?

**Show/Hide Answer**

Because it had too many problems!

**Hard Math Riddle 7 with Answer** : A duck was given $9, a spider was given $36, a bee was given $27. How much money would be given to a cat?

**Show/Hide Answer**

$18 ($4.50 per leg)

**Hard Math Riddle 8 with Answer** : If you multiplied all of the numbers on the dial pad of a smartphone, what would the total be?

**Show/Hide Answer**

Zero. Since the numbers 0 thru 9 are represented on a dial pad, anything times zero equals zero!

**Hard Math Riddle 9 with Answer** : What does an owl do his math with?

**Show/Hide Answer**

An owlqulater

**Hard Math Riddle 10 with Answer** : If you buy a rooster for the purpose of laying eggs and you expect to get three eggs each day for breakfast, how many eggs will you have after three weeks?

**Show/Hide Answer**

Zero, roosters do not lay eggs

**Hard Math Riddle 11 with Answer** : Divide 40 by one half, and then add 5. What’s the answer?

**Show/Hide Answer**

885, dividing by a half actually doubles a number.

**Hard Math Riddle 12 with Answer** : How will a mathematician win a war easily?

**Show/Hide Answer**

By putting his enemy in close brackets.

**Hard Math Riddle 13 with Answer** : If the zookeeper had 100 pairs of animals in her zoo and if two pairs of babies are born for each and every one of the original animals, and then sadly 23 animal don’t survive, how many animals do you have left in total?

**Show/Hide Answer**

977 animal (100 x 2 = 200; 200 + 800 = 1000; 1000 – 23 = 977)

**Hard Math Riddle 14 with Answer** : Can you add the number of sides from a triangle, a pentagon, and a hexagon? How many sides are there in total?

**Show/Hide Answer**

14 sides

**Hard Math Riddle 15 with Answer** : At the hardware store: I was quoted 12 cents for one, 24 cents for 50, and 36 cents for 144. I wanted six. What was I buying and how much did it cost me?

**Show/Hide Answer**

Prices quoted were for house numbers at 12 cents per number. A number’6′ cost me 12 cents.

**Hard Math Riddle 16 with Answer** : A little boy goes shopping and purchases 12 tomatoes. On the way home, all but 9 get mushed and ruined. How many tomatoes are left in a good condition?

**Show/Hide Answer**

Nine

**Hard Math Riddle 17 with Answer** : Sam is 14 years old, and Britta is half of her age. Now Sam is 34 years old. How old is Britta?

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27 years old

**Hard Math Riddle 18 with Answer** : What did the math book say to the psychiatrist?

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Would you like to hear my problems?

**Hard Math Riddle 1 with Answer** : At what time between 3 and 4 will the two hands coincides?

**Show/Hide Answer**

At 3 O’clock, the distance between two hands = 15 minutes. When they are at zero minutes distance, they are coincide to each other. Time taken = 15 minutes.

Minute hand is 55 minute ahead of hour hand in 60 minutes.

Then, at 1 minutes = 60/55.

Thus, at 15 minutes = (60 x 15) / 55 = 3 and 16 4/11 minutes

**Hard Math Riddle 1 with Answer** : Are the years 900 and 1000 leap years?

**Show/Hide Answer**

No, because 900 and 1000 are NOT divisible by 400.

**Hard Math Riddle 21 with Answer** : What was the math teachers favorite dessert?

**Show/Hide Answer**

Pi

**Hard Math Riddle 22 with Answer** : Eggs are $0.12 a dozen. How many eggs can you get for a dollar?

**Show/Hide Answer**

100 eggs, at one penny each

**Hard Math Riddle 23 with Answer** : You would like to purchase a snack from the vending machine for 75 cents. You have one quarter, 2 dimes, 4 nickels, and 5 pennies. Do you have enough money to purchase your snack?

**Show/Hide Answer**

No, you only have 70 cents

**Hard Math Riddle 24 with Answer** : What does a mermaid wear to math class?

**Show/Hide Answer**

Algebra

**Hard Math Riddle 25 with Answer** : Jeff has $28.75. He purchased three cookies that cost $1.50 each, five newspapers that each cost $0.50, five flowers for $1.25 each, and used the remainder of the cash on a pair of sunglasses. How much were the sunglasses?

**Show/Hide Answer**

$15.50

**Hard Math Riddle 26 with Answer** : John works at the zoo. If he tries to give each penguin its own exhibit, then he has one penguin too many. If he puts two penguins in each exhibit, then he has one exhibit too many. How many exhibits are there? How many penguins?

**Show/Hide Answer**

3 exhibits, 4 penguins

**Hard Math Riddle 27 with Answer** : What is easy to spot but hard to find?

**Show/Hide Answer**

Talent

**Hard Math Riddle 28 with Answer** : Maria went to the bread store to buy a loaf of bread for dinner. She had 2 quarters, 4 dimes, 3 nickels and 2 pennies. The total cost of the bread $0.82. She promised to make sure she had exactly 1 coin remaining after purchase. Which coins did she have left after buying the loaf of bread?

**Show/Hide Answer**

One of the quarters

**Hard Math Riddle 29 with Answer** : In a certain code language, 246 means ‘He is cool’, 653 means ‘cool and bright’ and 849 means ‘India is great’. Then, what is the code of ‘is’ in that language.

**Show/Hide Answer**

He is cool = 246 and India is great = 849. ‘is’ is common between these two sentences and 4 is common between 246 and 849. Thus, is = 4.

**Hard Math Riddle 30 with Answer** : Why did the student do multiplication problems on the floor?

**Show/Hide Answer**

The teacher told her not to use tables.