# Math Riddles

##### Math Riddle #169 (medium)

Question: Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation.

Note: Each must be used exactly once and no other numbers or symbols can be used.

##### Math Riddle #170 (medium)

Question: How can you add 8 8's to make 1000?

##### Math Riddle #179 (medium)

Question: Joe deals himself and his friend John some cards from a deck of cards (not the same amount). If John gives Joe some cards Joe will have 4 times as many cards as John. If Joe gives John the same number of cards he will have 3 times as many cards as John.

How many cards does each man have and how many cards do they trade?

##### Math Riddle #193 (hard)

Question: A man wants to have a party in thirty-one days where he will be serving his 1000 barrels of wine. The only problem is that one of his enemies poisoned one of the barrels. The poison kills any man who drinks any of the wine in about 30 days, give or take a few hours. The man has 10 plants that are also killed by the poison in 30 days and can be used to test the wine. How can identify the single poisoned barrel of wine?

##### Math Riddle #198 (medium)

Question: John has been hired to paint the numbers 1 through 100 on 100 apartments.

How many times with he have to paint 8?