SOLUTION: Peters granny is 6 times older than him. Peters mum is 3 times as old as him.Peters dad is 4 times as old as him. If peters dad is 12 years older than his mum,how old is his gran?

Algebra ->  Human-and-algebraic-language -> SOLUTION: Peters granny is 6 times older than him. Peters mum is 3 times as old as him.Peters dad is 4 times as old as him. If peters dad is 12 years older than his mum,how old is his gran?      Log On


   



Question 176641: Peters granny is 6 times older than him. Peters mum is 3 times as old as him.Peters dad is 4 times as old as him. If peters dad is 12 years older than his mum,how old is his gran?
Answer by MathTherapy(10553) About Me  (Show Source):
You can put this solution on YOUR website!
Let Peter’s age be p, then
Peter’s grandma’s age is 6p
Peter’s Mum’s age is 3p
Peter’s Dad’s age is 4p

Since Peter’s Dad is 12 years older than Peter’s Mom, then
3p + 12 = 4p
p = 12

Since Peter is 12, then Peter’s grandma is 72