Welcome To HelpOut! The Home for All Your Questions
63 views
asked Apr 4 in Mathematics by (220 points)

1 Answer

0 like 0 dislike
answered Apr 5 by Donna

Let the first(elder) and second sisiter be x and y respectively.

x/y = 4/3........eqn 1

x = y + 3......eqn 2

Putting x = y + 3 into eqn 1

We now have (y + 3)/ y = 4/3

4y = 3(y + 3)

4y = 3y + 9

4y - 3y = 9

y = 9

Therefore the younger sister is 9 years old.

commented Apr 6 by (2.9k points)
0 0
Okay

That's good
...