Question

Solve $3\frac{2}{5}-2\frac{1}{4}$.

Answer 1

$3\frac{2}{5}-2\frac{1}{4}=\frac{17}{5}-\frac{9}{4}=\frac{17\times 4}{5\times 4}+\frac{9\times 5}{4\times 5}=\frac{68}{20}+\frac{45}{20}=\frac{23}{20}$