Question

2/5 plus what equals 7/10

Answer 1

`\frac 3{10}`

Explanation:

`~~~~~~\frac 25 + x = \frac 7{10}\\\\\\\implies x = \frac 7{10} - \frac 25\\ \\\\\implies x = \frac 7{10} - \frac 4{10}\\\\\\\implies x = (7-4)/(10)\\\\\\\implies x = \frac 3{10}`