Question 752277
Marla's Grandma is currently 3 times older than Marla,
g = 3m
:
 but 25 years from now Marla will be half her Grandma's age.
m + 25 = {{{1/2}}}(g+25)
Multiply both sides by 2, resulting in
2(m+25) = g + 25
2m + 50 = g + 25
2m = g + 25 - 50
2m = g - 25
Replace g with 3m
2m = 3m - 25
25 = 3m - 2m
25 = m
:
 How old is the Grandma right now?
g = 3(25)
g = 75 yrs