exam Maths Puzzle Numerical Ability

Please help me find the geometric mean between the numbers: 3 and 24

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exam Other Question

a fruit company makes snak containing dried apples and raisins. Dried apples cost 38 cents per ounce, and raisins cost 28 cents per ounce. To make a 10 ounce snack that will cost 34 cents and ounce, how much of each dried fruit will be used? A mississippi riverboat can travel 30km downstream in 3 hours and make the return trip in 5 hours. Find the speed of the boat in still water.