Problem 811

Sir SagarJuly 3, 2015July 3, 20150

If y varies inversely as x, and y = 18 when x = 5, find y when x = 8.

Solution:-

y = $\frac{k}{x}$

18 = $\frac{k}{5}$

k = 90

y = $\frac{90}{8}$

y = $\frac{45}{4}$

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