Question

please tell answer please.​

Answer 1

Let the number be x

I suppose that the meaning of the question could be explained by this equation.

$\frac{3 + x}{5 + x} = \frac{13 + x}{19 + x}$

By doing criss-cross

(3+x)×(19+x)=(5+x)×(13+x)

57+22x+x2=65+18x+x2

Get the like terms together

22x−18x+x2−x2=65–57

Simplify

4x=8

x=2

Let's check our answer.

3+2=5 5+2=7 13+2=15 19+2=21

15/21 = 5/7

The answer is 2

Answer 2

Answer:

The answer is 2 of the question