Question

encontre o número desconhecido
$\frac{35}{28} = \frac{?}{4}$
$\frac{5}{4} = \frac{15}{?}$
$\frac{7}{5} = \frac{42} {?}$
​

Answer 1

Oi....

a)

35/28 = x/4

28x = 35.4

28x = 140

x = 140/28

x = 5

35/28 = 5/4

b)

5/4 = 15/x

5x = 4.15

5x = 60

x = 60/5

x = 12

5/4 = 15/12

c)

7/5 = 42/x

7x = 5.42

7x = 210

x = 210/7

x = 30

7/5 = 42/30

Bons estudos.