Logic Riddles

Logic riddles with answers involve looking at situations and making judgements about them by ruling out impossibilities. If you like solving maths puzzles, you will most probably like logic riddles as well.

Pot of Beans

A pot contains 75 white beans and 150 black ones. Next to the pot is a large pile of black beans.

A somewhat demented cook removes the beans from the pot, one at a time, according to the following strange rule: He removes two beans from the pot at random. If at least one of the beans is black, he places it on the bean-pile and drops the other bean, no matter what color, back in the pot. If both beans are white, on the other hand, he discards both of them and removes one black bean from the pile and drops it in the pot.

At each turn of this procedure, the pot has one less bean in it. Eventually, just one bean is left in the pot. What color is it?

Riddle Answer

Oracle at Temple

A man went to a temple to find an Oracle. When he arrived, he saw that there were two identical people standing in the temple, both wearing the exact same thing.

The two men told the man that if he wanted his future read, he would have to do something first. They told him that only one of them was the real Oracle and that he had to figure out which is which. They also added that one of them only tells lies while the other only tells the truth and the man could only ask them one question.

What question does the man ask?

Riddle Answer

Magic Grass

At a garden shop they’re selling Magic Grass, a patch of sod that doubles in size every day. A man goes to buy some and figures that his garden is big enough that if he buys one patch, it will cover his garden in 14 days, because each day it doubles in size. So he decides to speed up the process, and buys two patches of sods.

How many days will it now take for the Magic Grass to cover his garden?

Riddle Answer

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