Question

80% dintr-un numar este 2400.Aflati 30% din nr .

Answer 1

$\frac{80}{100} * x = 2400\\ \\\frac{80x}{100} = 2400\\\\\frac{8x}{10} = 2400\\\\ 8x = 10 * 2400\\\\ 8x = 24000\\\\ x = 24000 : 8\\\\ x = 3000\\\\\\\frac{30}{100} * x = 900$

Answer 2

80% din a = 2 400

80 a / 100 = 2 400

80 a = 240 000

a = 240 000 : 80

a = 3 000 → numarul

Verific: 80 % din 3 000 ⇒ 3000 : 100 x 80 = 2 400

30 % din 3 000 ⇒ 3000 : 100 x 30 = 900