Question

2. Calcule:
u
L
A) 10% DE 60
B) 10% DE 74
C) 20% DE 25
D) 30% DE 135
E) 25% DE 168
F) 40% DE 38
G) 50% DE 85​

Answer 1

Resposta:

a) 10% de 60

10/100 = x/60 -> 10 . 60 = 100x -> 600 = 100x -> x = 600÷ 100 = 6

b) 10% de 74

10/100 = x/74 -> 10 . 74 = 100x -> 740 = 100x -> x = 740 ÷ 100 = 7,4

c)20% de 25

20/100 = x/25 -> 20 . 25 = 100x -> 500=100x -> x= 500÷100 = 5

d) 30% de 135

30/100 = x/135 -> 30 . 135 = 100x -> 4050 = 100x -> x= 4050÷100 = 40,5

e) 25% de 168

25/100 = x/168 -> 25 . 168 = 100x -> 4200= 100x -> x=4200÷ 100 = 42

f) 40% de 38

40/100 = x/38 -> 40 . 38 = 100x -> 1520 = 100x -> x=1520 ÷ 100= 15,2

g)50% de 85

50/100 = x/85 -> 50 . 85 = 100x -> 4250 = 100x -> x=4250 ÷ 100 = 42,5