Question

Maggie's brother is 3years younger than twice her age. The sum of their ages is 24. How old is Maggie?

Answer 1

b=bro's age
m=maggie's age


b=-3+2m

m+b=24

subsitute
m-3+2m=24
3m-3=24
add 3 both sides
3m=27
divide by 3
m=9


maggie is 9 year old