Question

4. Если 3 4, 7, то чему равно-?​

Answer 1

$\frac{a}{b} = 4 = > a = 4b \\ \frac{b}{c} = 7 = > c = \frac{b}{7} \\ \frac{a}{c} = 4b \div \frac{b}{7} \\ \frac{a}{c} = 4b \times \frac{7}{b} \\ \frac{a}{c} = 28$