Question

What should be added to $7\frac{3}{5}$ to get 18?

Answer 1

Required number to be added = $18-7\frac{3}{5}$

=$\frac{18}{1}-\frac{38}{5}$

= $\frac{90-38}{5}$ [∵ LCM of 1 and 5 = 5]
= $\frac{52}{5}=10\frac{2}{5}$

Hence, the required number is $10\frac{2}{5}$.