Question

210:х=420:6 х:20=40*3

Answer 1

1)
$frac{210}{x} = frac{420}{6}$
$x = frac{210}{frac{420}{6}}$
$x = frac{1}{frac{2}{6}}$
$x = frac{1 * 6}{2}$
$x = 3$
2)
$frac{x}{20} = 40 * 3$
$x = 40 * 3 * 20$
$x = 2400$