Question

The present ages of mary and jack are in the ratio of 1:2. three years from now, the ages will be in the ratio of 3:5. find the present ages of mary and jack

Answer 1

Answer:

mary = 6       jack = 12 y/o

Step-by-step explanation:

m/j = 1/2       re-arrange to   j = 2m

In three years

(m+3) / (j+3) =   3/5        sub in j = 2m

(m+3) / (2m+3) = 3/5

(m+3) * 5   = (2m+3) * 3

5m + 15 = 6m + 9

6 = m                           then      j = 2m = 12    y/o