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asked 2 weeks ago in Mathematics by (220 points)

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answered 2 weeks ago 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 2 weeks ago by (2.9k points)
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