sheela is 6 years older than half of her sisters age. if sheela is 31 years old then how old is her sister?

Question

pls explain fast i need it 

Answer 1

Let S = Sheella's age and x = sister's age

 

S = (x/2) + 6 = 31

 

Multiply by 2

 

x + 12 = 62

 

x = 50