Math Riddles

These Math Riddles are based on math concepts and can be solved with a bit of math and logic. These fun riddles can surely give you a tough time.

River Crossing – Wolf, Sheep, Cabbage

A farmer must transport a wolf, a sheep and cabbage from one side of a river to another using a boat. But in crossing the river by boat, the farmer could carry only himself and a single item – the wolf, the sheep or the cabbage.

If left together, the wolf would eat the sheep, or the sheep would eat the cabbage.

How can the farmer transport the wolf, the sheep and the cabbage across the river without losing any of them?

Riddle Answer

Counterfeit Money

A man goes into a barber shop and gets a haircut for $15. He pays the barber with a $20 bill, but the barber doesn’t have change. The barber goes to the neighboring flower shop and trades the $20 bill for a $10 dollar bill and two $5 bills. Then he gives the man his $5 in change.

Later the lady from the flower shop confronts the barber and tells him that the $20 bill he gave her was counterfeit money. The barber agrees and he gives the lady a different $20 bill.

Later that day he tries to figure out how much money he lost. How much money did the barber lose?

Riddle Answer

Gold for 7 Days of Work

A contractor is doing work for 7 days at your home. You have a gold bar that is worth $7000. You need to pay him $1000 every day and $7000 in total. You have to pay him in gold by using the gold bar. How can you pay him $1000 worth of gold everyday by cutting the gold bar only twice?

Answer

By cutting the gold bar twice, you can have 3 pieces of gold.

Let the gold bar pieces be GB1, GB2 and GB3. They are worth $1000, $2000 and $4000 respectively.

Day1: Give GB1

Day2: Take GB1, Give GB2

Day3: Give GB1

Day4: Take GB1, GB2 and give GB3

Day5: Give GB1

Day6: Take GB1, Give GB2

Day7: Give GB1