Question

Calcule: a) 25% de 40% de 180 = b) 15% de 130% de 200 = c) 25% de 80% de 300 =

Answer 1

Resposta:

a) 18

b)  39

c) 60

Answer 2

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a) 25% de 40% de 180

$\frac{25 \div 25}{100 \div 25} \times \frac{40 \div 20}{100 \div 20} \times 180 \\ \frac{1}{4} \times \frac{2}{5} \times 100 \\ \frac{2}{5} \times 45 \\ 2 \times 9 \\ 18$

b) 15% de 130% de 200

$\frac{15}{100} \times \frac{130 \div 10}{100 \div 10} \times 200 \\ 15 \times \frac{3}{10} \times 2 \\ 15 \times \frac{13}{5} \\ 3 \times 13 \\ 39$

c) 25% de 80% de 300

$\frac{25}{100} \times \frac{80}{100} \times 300 \\ 25 \times \frac{80}{100} \times 3 \\ \frac{80}{4} \times 3 \\ 20 \times 3 \\ 60$