Question

Find the missing number___:7 = 12:21
A. 3
B. 4
C 14
D 12​

Answer 1

B. 4.

Explanation:

Let the number be x then

x/7 = 12/21

Crossmultiply:

x = 7*12 / 21

x = 12 / 3 = 4.

Answer 2

B. 4 would be your answer.

Explanation:

7 x 3 = 21

4 x 3 = 12

:)