Question

A boy is 5 years older than his sister. The sum of their ages is 15 years. Find their ages.​

Answer 1

Answer:

Boy:-18 yrs old/Girl:-13 yes old

Step-by-step explanation:

Let sister's age be "x" ; boy's age is "x+5".

EQUATION:

x + x+5 = 31

2x=26

x=13 yrs old

x+5 = 18 yrs old.

Answer 2

Answer:

Let the boy's Sisters age be 'x' . This means that the boy age is 'x+5'.

As per the question,

x(x+5) = 15

=>2x+5 = 15

=> 2x= 15-5= 10

=>2x= 10

=>x= 10/2 = 5

So, The boy's age (x) = 5

This means that his Sister (x+5) = 5+5 = 10