Three positive numbers are in the ratio 2 : 3 : 5 and the sum of their squares is 1368. What is the largest number?
Correct answer C. 30
Explanation
4k^2 + 9k^2 + 25k^2 = 38k^2 = 1368, so k^2 = 36 and k = 6. The largest number is 5 x 6 = 30.
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