Question

what should be added to 9/16 to make it equal to 15​

Answer 1

15-9/16

= 240-9/16

= 231/16

Therefore, 231/16 should be added to 9/16 to get 15

Answer 2

Let the number be X.

$X + \frac{9}{16} = 15 \\ X = 15 - \frac{9}{16} \\ X = \frac{240 - 9}{16} \\ X= \frac{231}{16}$

Hence, $\frac{231}{16}$ should be added to $\frac{9}{16}$ to obtain 15.