Bookshop

Ali went to a bookshop. He spent 3/5 of his money on books and 1/4 of it on a pen. What fraction of his money did he spend altogether? What fraction of his money did he have left?

Correct answer:

x =  17/20
y =  3/20

Step-by-step explanation:

$x=\frac{3}{5}+\frac{1}{4}=\frac{12}{20}+\frac{5}{20}=\frac{12+5}{20}=\frac{17}{20}=0.85$

$y=1-x=1-\frac{17}{20}=\frac{1\cdot 20}{20}-\frac{17}{20}=\frac{20}{20}-\frac{17}{20}=\frac{20-17}{20}=\frac{3}{20}=0.15$

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