Question

a boy is five year older than his sister. the sun of their ages is 15. find their ages​

Answer 1

Answer:

let boy age =x and sister age =y

x=5+y eqn.. 1

x+y =15. eqn..2

puttin 1 in 2

5+y+y=15

2y=10

y=5

then x will be

x=5+y

=5+5=10