Question

pls. solve this tomorrow is my test​

Answer 1

Step-by-step explanation:

Since A is 20% less than b.

$\therefore \: a = b - 20 \% \: of \: b \\ \therefore \: a = b - \frac{20}{100} b = b - 0.2b = 0.8b \\ now \\ \frac{a}{b} = \frac{0.8b}{b} = 0.8 = \frac{8}{10} = \frac{4}{5} \\ \\ \frac{b - a}{b} = \frac{b - 0.8b}{b} = \frac {0.2b}{b} = 0.2 \\ = \frac{2}{10} = \frac{1}{5} \\ \\ \frac{a}{b - a} = \frac{0.8b}{0.2b} = \frac{0.8}{0.2} = 4$

Answer 2

Pls have a look at the pic.

Hope it is helpful and

BEST OF LUCK FOR THE TEST!!!