let

c = the age of Craig now

f = the age of his father now

Craig is 24 years younger than his father

c = f - 24

in 10 years Craig's father will be three times as old as Craig will be

10 + f = 3(c + 10)

by solving the system of equations

c = f - 24

10 + f = 3(c + 10)

we find

c = 2 years

f = 26 years

click here to see the step by step solution of the system of equations

Craig is 2 years old now and his father is 26 years old now.