Correct Answer: Option C

Explanation

N ∝ M
∴N = kM where k is a constant
N = 8 when M = 20
∴ 8 = k x 20
\(k = \frac{8}{20}\) = \(\frac{2}{5}\)
∴ N = \(\frac{2 M}{5}\)
If N = 7
∴ 7 = \(\frac{2 M}{5}\)
M = \(\frac{35}{2}\) = 17\(\frac{1}{2}\)

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