Question

6) Calcule os valores desconhecidos:
a)
2
3
=
18
???

b)
8
???
=
2
33

c)
9
????
=
5
3
d)
1
2
=
????
10

Answer 1

Multiplicando cruzado:

a)

$\frac{2}{3} = \frac{18}{ \times } \\ 2 \times x = 3 \times 18 \\ 2x = 54 \\ x = \frac{54}{2} \\ x = 27$

b)

$\frac{8}{x} = \frac{2}{33} \\ x \times 2 = 8 \times 33 \\ 2x = 264 \\ x = \frac{264}{2} \\ x = 132$

c)

$\frac{x}{9} = \frac{5}{3} \\ x \times 3 = 9 \times 5 \\ 3x = 45 \\ x = \frac{45}{3} \\ x = 15$

d)

$\frac{1}{2} = \frac{x}{10} \\ 2 \times x = 1 \times 10 \\ 2x = 10 \\ x = \frac{10}{2} \\ x = 5$