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Math & Logic · Ages 10–12

Riddle #90

A bat and a ball together cost $1.10. The bat costs exactly $1.00 more than the ball. How much does the ball cost?

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Answer: 5 cents

If the ball costs x, the bat costs x + $1.00, so 2x + $1.00 = $1.10, meaning x = $0.05.

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#91 In a class, exactly half the students are girls. If 3 more girls join the class, girls would make up 60% of the class. How many students were originally in the class?
#92 Pick any number. Double it, add 6, divide the result by 2, then subtract your original number. What do you always end up with?
#93 A snail is at the bottom of a 10-meter well. Each day it climbs up 3 meters, but each night it slides back down 2 meters. How many days does it take the snail to reach the top?

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