Question

Mary is 14 years younger than her sister Jane. In four years, Jane will be 3 times older than Mary. How old is Jane now?

3

7

17

21

Answer 1

consider x represents the age of mary and y represents the age of jane

X= y - 14

y+4 = 3 (x+4)

subtitute first eqn in the second
y+4 = 3(y - 10)
solving it
y + 4 = 3y - 30
2y = 34
y = 17

Answer 2

oh thanks