Question

The sum of Joy's age and her brother's age is 24. Her brother's age is 3 years older than twice Joy's age.

Answer 1

Let x be Joy's age and y be her brother's age
From the second sentence, y = 2x + 3.

x + y = 24; x + 2x + 3 = 24
3x + 3 = 24
3(x + 1) = 24
x + 1 = 8
x = 7

Joy is 7 years old and her brother is 17 years old.

Answer 2

Joys age = X  Her Brothers age + 2x+3  Joy is 7 yrs old And her Brother is 17 yrs old