
Andrew M. answered 01/07/18
Tutor
New to Wyzant
Mathematics - Algebra a Specialty / F.I.T. Grad - B.S. w/Honors
m = mans current age
d = daughters current age
two years from now he will be three times her age:
m+2 = 3(d+2)
m + 2 = 3d + 6
m - 3d = 4 {equation 1}
Current age gap is 30 years
m = d + 30 {equation 2}
Replace m with d+30 in equation 1
d + 30 - 3d = 4
Solve for d. Then use m = d+30