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 By: JessicaTan (offline)  Tuesday, December 04 2012 @ 07:17 AM CST (Read 767 times)
JessicaTan

Mrs Hua's age and her daughter's age are in the ratio 6:1. Mrs Hua is 30 years older than her daughter. In how many years' time will whe be 4 times as old as her daughter? (ans : 4 years time)

thanks

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Registered: 10/17/09
Posts: 82

 By: jo sarah (offline)  Tuesday, December 04 2012 @ 08:48 AM CST
jo sarah

Mrs Hua's age and her daughter's age are in the ratio 6:1. Mrs Hua is 30 years older than her daughter. In how many years' time will whe be 4 times as old as her daughter?

This is a constant-difference case: no matter when, the mother and daughter's age will always differ by 30 years.

So when mother is 4 times age of daughter,
3 units ---> 30 years
1 unit ---> 10 years
that is, daughter will then be 10 years old.

Now, 5 parts ---> 30 years
so that 1 part ---> 6 years
that is, daughter is now 6 years old.

Thus, it will be in 10 - 6 = 4 years' time.

Cheerio!

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Registered: 03/20/12
Posts: 111

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