Four numbers formed by adding 1, 5, 10 and 15 to a certain number are – InterviewSolution

1.

Four numbers formed by adding 1, 5, 10 and 15 to a certain number are in proportion. Find the number?

Answer»

Let the number be x

∴ 1 + x, 5 + x, 10 + x, 15 + x are in proportion

∴ (5 + x) (10 + x) = (1 + x) (15 + x)

50 + 10x + 5x + x² = 15 + 15x + x + x²

⇒ x= 35

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