Question

3 years later a sister will be a 4 times as old as her brother, 3years ago the sister age was two times her brother’s age will be 4 years hence. What are their predent ages?

Answer 1

Answer:

14

Step-by-step explanation:

Answer 2

Answer:

Let age of sister be x and brother be y.

According to the first condition,

x +3 = 4(y +3)

x + 3 = 4y + 12

x - 4y = 12 - 3

x - 4y = 9 ----------- equation 1

According to second condition,

x- 3 = 2(y- 3)

x - 3 = 2y - 6

x - 2y = -6 + 3

x - 2y = -3 --------- equation 2

By solving 1 and 2

x - 4y = 9

x - 2y = -3

---------------

- 2y = 12

y = 12/-2

y = -6

Substituting the value of y = -6 in equation 1

x - 4y = 9

x - 4(-6) = 9

x + 24 = 9

x= 9 - 24

x = -15