exam Maths Puzzle Numerical Ability

after rowing two miles upstream, a rower passes a log in the river. he rows on for one more hour before turning around and rowing back to his starting point where the log has reach

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exam Other Question

Find the volume of a right circular cone where the radius of the base is 21 in. and the height is 9 in. Give the exact value.

I think the formula is V=1/3 pie r squared h. The sum of three numbers is 8. Twice the smallest is 2 less than the largest, and the sum of the largest and smalles is 5. Use linear system in three variables to find the three numbers.