exam Maths Puzzle Numerical Ability

PLEASE HELP ME TO SOLVE THIS EQUATION. Find the the third term in a proportion whose first, second, and fourth terms are 6, 15,10, respectively.

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exam Other Question

The mean weight of newborn infants at a community hospital is 6.6 pounds. A sample of seven infants is randomly selected and their weights at birth are recorded as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds.
radical 18x^10y
please help