Carlos is 1/7 his grandmother's age They share the same birthday. In 5 more years he will be 1/5 his grandmother's age. How many years old was his grandmother when he was born?

Question

mertsj · Answer

g= grandma's age
1/7g = carlos's age
g+5=grandma in 5 years
1/7g+5 = Carlos in 5 years.
1/7g+5=1/5(g+5)

anonymous · Answer

When I cross multiply, and solve for g, I got i negative number
g+5/7 = g+5/5
5g+25=7g+35
-10 = 2g
-5 = g

mertsj · Answer

I know.  This problem makes no sense.  Doe it mean in 5 years he will be 1/5 his grandma's current age?

mertsj · Answer

It must because then I get that his grandma is 87 1/2

mertsj · Answer

1/7g+5=1/5g

anonymous · Answer

and Carlos will be 12 1/2 ,

mertsj · Answer

And Carlos is 12.5  So grandma was 75 when he was born.

anonymous · Answer

Thank you very much!!

mertsj · Answer

yw