alex is twice as old as Marty. Gloria is three years older than Marty. Alex is 4 years older than Gloria. What are their ages?

Question

Its solving systems of equations with 3 variables.

Answer 1

1). a = 2m

2). g = m+ 3

3). a = g+ 4

 

substitute 3 into 1

g+4 = 2m

 

substitute 2 into this

m+ 3 + 4 = 2m

 

m+ 7 = 2m

m = 7

 

a = 2m = 14

 

g = m+3 = 10

 

Alex is 14, Marty is 7, Gloria is 10