Question

Determine o valor de:

a) 26% de 690.

b) 38,5% de 80.

c) 0,79% de 920.

d) 35% de 75%.

e) 230% de 450.​

Answer 1

Resposta:

a) 26% de 690.

100%---------690

26%-----------x

$100x = 690 \times 26 \\ 100x = 17940 \\ x = \frac{17940}{100} \\ x = 179.4$

b) 38,5% de 80.

100%--------------80

38,5%--------------x

$100x = 38.5 \times 80 \\ 100x = 3080 \\ x = \frac{3080}{100} \\ x = 30.8$

c) 0,79% de 920.

100%--------------920

0,79%--------------x

$100x = 0.79 \times 920 \\ 100x = 726.8 \\ x = \frac{726.8}{100} \\ x = 7.268$

d) 35% de 75%.

100%--------------75%

35%--------------x

$100x = 35 \times 75 \\ 100x = 2625 \\ x = \frac{2625}{100} \\ x = 26.25$

e) 230% de 450.

1000%-----------450

230%--------------x

$1000x = 450 \times 230 \\ 1000x = 103500 \\ x = \frac{103500}{1000} \\ x = 103.5$