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S1 Mathematics

Question post on Mon, 28/05/2018 11:13pm

Anyone help me with attached question

Thanks

Khong Pek Mao · Answer 1 · Post on Thu, 31/05/2018 2:52pm

This is a Simultaneous Equation question.

Let Cindy be x years, sister be y years old.

x + y = 38

x = 38 – y (1)

7 year ago, (amendments )

(x – 7) / 3 = (y – 7) / 1

x – 7 = 3y – 21 (2)

Subt (1) into (2)

38 – y – 7 = 3y – 21

31 + 21 = 3y + y

4y = 52

y = 52 ÷ 4 = 13

x = 38 – 13 = 25 year old

anilkumar · Answer 2 · Post on Sat, 02/06/2018 12:44pm

anilkumar Post on Sat, 02/06/2018 12:44pm

Thanks for solution. But answer was given 25 years old.

please advise.

Khong Pek Mao · Answer 3 · Post on Sat, 02/06/2018 7:24pm

Khong Pek Mao Post on Sat, 02/06/2018 7:24pm

Sorry for the mistake.

I have amended the solution.

Please check.