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Math & Logic · Ages 10–12

Riddle #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?

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Answer: 3

The math always simplifies to 3, no matter which number you start with.

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More Math & Logic riddles for Ages 10–12

#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?
#94 You have 8 identical-looking coins. One is a fake that's slightly heavier than the rest. Using a balance scale, what's the fewest number of weighings you need to guarantee finding the fake?
#85 It's 3:15 on a clock. What is the angle between the hour hand and the minute hand, in degrees?

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