Just for genius

Question: 2+3=8 4+5=24 6+7=42 8+9=80 9+10=?

Riddle Discussion

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The glass is a right cylinder.

Logic Riddle (medium)

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Question: Mr. Smith has 4 daughters. Each of his daughters has a brother.

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Question: There is a 5 gallon and a 3 gallon box. You also have a hose with unlimited water. How are you gonna make the 5 gallon have 4 gallons using your items? (You do not know the exact measure measurements of a gallon)