Question

The numbers of boys and girls in a class are in the ratios 5:7. Four years later the sum of their ages will be 56 years. What are their present ages?

Answer 1

Hey...!!!

Let the number be 5x and 7x.
So,
5x + 4 + 7x + 4 = 56
12x + 8 = 56
12x = 56 - 8
12x = 48
X = 48/12
X = 4
So, 5x = 4 * 5 = 20
7x = 4 * 7 = 28

Hope it helps...!!!

Answer 2

Answer:

Hey...!!!

Let the number be 5x and 7x.

So,

5x + 4 + 7x + 4 = 56

12x + 8 = 56

12x = 56 - 8

12x = 48

X = 48/12

X = 4

So, 5x = 4 * 5 = 20

7x = 4 * 7 = 28

Hope it helps...!!!

Step-by-step explanation: