Question

What number should be subtracted from $\frac{3}{7}$ to get $\frac{5}{4}$?

Answer 1

Let the required number be $x$

According to the question,

$\frac{3}{7}-x=\frac{5}{4}$

$\Rightarrow x=\frac{3}{7}-\frac{5}{4}$

$=\frac{3\times 4}{7\times 4}-\frac{5\times 7}{4\times 7}$

$=\frac{12-35}{28}$

$=\frac{-23}{28}$

$\therefore x=-\frac{23}{28}$

Hence, the required number is $-\frac{23}{28}$.