Math Question x3

Question

The sum of the ages of Demetrius and Lindsey is 93 years. 9 years ago, Demetrius's age was 4 times Lindsey's age. How old is Demetrius now?

Answer 1

D+L = 93

D = 93-L

D-9 = 4(L-9) = 4L -36

D = 4L-27

D = -L + 93

5L = 120

L = 24 years old now for Lindsey

D = 93-24 = 69 years old now for Demetrius

9 years ago

69-9 = 4(24-9)

60 = 4(15)