Question

what shuold be added to (1/2+1/3+1/5) to get 3 ?​

Answer 1

refer to the attachment

hope it helps you

Answer 2

Answer:

$let \: the \: no. \: be \: x \\ \frac{1}{2} + \frac{1}{3} + \frac{1}{5} + x = 3 \\ \frac{15 + 10 + 6}{30} + x = 3 \\ \frac{31}{30} + x = 3 \\ x = 3 - \frac{31}{30} \\ x = \frac{90 - 31}{ 30} \\ x = \frac{59}{30}$