My brother is 5 years older than me. my sister is 3 years younger than me. how old will my sister be when my brother is 29?

Let us Assume that The Present Age of your Brother is 29

Given : Your Brother is 5 years Older than You

⇒ The Present Age of You is 29 - 5 = 24

Given : Your Sister is 3 years younger than You

⇒ The Present Age of your Sister is 24 - 3 = 21

⇒ Your Sister will be 21 years Old when your Brother is 29

set each factor equal to 0

4x-3 = 0

2x-1 = 0

solve for x.

4x-3=0

4x=3

x= 3/4

solve for x. 

2x-1= 0

2x= 1

x= 1/2

your answer should be 1/2 is less than or equal to x and 3/4 is greater than or equal to x