Question

Find the missing number.

$\frac{10}{18}=\frac{?}{27}$

Answer 1

Given:

$10˸18=?˸27$

Here one mean is missing.

$\mathrm{One}\mathrm{mean}=\frac{\mathrm{Product}\mathrm{of}\mathrm{extremes}}{\mathrm{other}\mathrm{mean}}$

$=\frac{10\times 27}{18}$

$=15$

Hence, the missing number is $15$.