Question 247719
Andrew’s grandfather’s age is twelve times Andrew’s age.
 If Andrew’s grandfather was 55 years old when Andrew was born, how many years old is Andrew now?
:
Let x = Andrew's age now
then
12x = Grandpa's age now
:
It says,"Andrew’s grandfather was 55 years old when Andrew was born," therefore:
12x - 55 = Andrew's age now
So we can say
x = 12x - 55
55 = 12x - x
55 = 11x
x = {{{55/11}}}
x = 5 yrs old is Andrew now
:
:
Check by finding Grandpa's age: 12 * 5 = 60 yrs ols
A 55 year age difference