Question 1206462
Grandpa and his grandson Gary both had their birthday yesterday.

 Today, grandpa's age in years is an even number and 15 times that of Gary. In 4 years time Grandpa's age in years will be the square of Gary's age in years. How many years older than Gary is grandpa today?

 Let Grandson's age to day be x years
Grandpa's age will be 15x

After 4 years

15x+4 = (x+4)^2

15x +4 = x^2+8x+16

x^2-7x+12=0

x^2-4x-3x+12 =0

x(x-4)-3(x-4)=0

(x-3)(x-4)=0

x = 3 OR 4

Grandson's age is 4

Grandpa's age = 15*4 =60   (Grandpa's age is even)

find the difference