Dan is 4 times as old as Tim. 8 years from now the sum of their ages will be 71. How old are they now

They are 63 years old. subtract 8 from 71

D=dan age

t=tim age

d is 4 times as old as tim

d=4t

8 years from now (d+8 and t+8)

sum is 71

d+8+t+8=71

d+t+16=71

minus 16

d+t=55

sub d=4t

4t+t=55

5t=55

divide both sides by 5

t=11

sub back

d=4t

d=4 (11)

d=44

dan is 44 and tim is 11