If 21x = 79x, what is the value of x?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

On rolling two dices (six-sided normal dice) together, what is the probability that the first one comes up with a 2 and the second one comes up with a 5?

Solve the alphametic puzzle by replacing the alphabet with the number.

S T O R M +
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T O W E L
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Buy me, smell me or deliver me, I do not change.

Who am I?

He loves to dance, twist and prance, he shakes his tail, and as a way he sails, wingless he flies into the sky. What is he?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?