Answer:
Jason = 20yrs.old
Mandy = 15yrs.old
Explanation:
Let
J = Jason's age
M = Mandy's age
J+M=35 ..... eq. 1
J−10=2(M−10) ..... eq. 2
From eq. 1
J=35−M
Substitute this in eq. 2.
(35−M)−10=2(M−10)
35−10−M=2M−20
35−10+20=2M+M
45=3M
453=3M3
15=M
J=35−M
J=35−15
J=20
