Question

А) 6/7 : × = 6/21

Б) × : 3/7= 14/15

Answer 1

А)
6/7 ÷ х = 6/21
6/7 × 1/х = 6/21
6/7х = 6/21
42 = 14х
14х = 42
х = 42/14
х = 3

Б)
х ÷ 3/7 = 14/15
х × 7/3 = 14/15
7/3х = 14/15
х = 2/5

Answer 2

A)
$\frac{6}{7} \div x= \frac{6}{21}$
$x = \frac{6}{7} \div \frac{6}{21}$

$x = \frac{6}{7} \times \frac{21}{6}$
$x = \frac{6 \times 21}{6 \times 7}$
$x = 3$
Б)
$x \div \frac{3}{7} = \frac{14}{15}$
$x = \frac{3}{7} \times \frac{14}{15}$
$x = \frac{3 \times 14}{7 \times 15}$
$x = \frac{2}{5} = 0.4$