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1. If x : 7.5 = 7 : 17.5, then the value of x is -

A. 1

B. 2.5

C. 3

D. 3.5

Solution:

\begin{aligned} = x : 7.5 = 7 : 17.5 \\ \Rightarrow 17.5 x = 7.5 \times 7 \\ \Rightarrow x = \frac{7.5 \times 7}{17.5} \\ = 3 \end{aligned}

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