Sudha is 32 years older than her daughter sheila.How old will be sheila when the sum of their age is 40

Question

I need help for this sum 

Answer 1

x=Sheila's age

x+32=Sudha's age

x+(x+32)=40

2x+32=40

2x=40-32

2x=8

x=8/2

x=4 years old