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maths help- urgent
Posted: Sat Sep 24, 2011 3:51 pm
by rejim2
Rhys and Ricky's age add upto 10. In 10 years time , Rhys will be one and a half times as old as Ricky. How old is Ricky now?
Many Thanks,
Re: maths help- urgent
Posted: Sat Sep 24, 2011 4:20 pm
by NorthLondonMum
In 10 years time their ages will add up to 30 (10 +10 +10), Rhys age will be 3/5 of 30, Ricky 2/5 of 30, which makes Ricky 12 in 10 years, therefore he his 2 now.
I think that works?
Re: maths help- urgent
Posted: Sat Sep 24, 2011 5:44 pm
by rejim2
Thankyou, NorthlondonMum!. Got it.
Re: maths help- urgent
Posted: Mon Apr 09, 2012 5:15 pm
by Jehan
Why will their ages add up to 30 in ten years' time and not 20, if they add up to ten now? Sorry- I am awful at the logic at Maths.
Re: maths help- urgent
Posted: Mon Apr 09, 2012 5:35 pm
by hermanmunster
Because they are adding ten years each to the total
Re: maths help- urgent
Posted: Mon Apr 09, 2012 5:43 pm
by tco
The equations are:
Rh + Ri = 10
Rh + 10 = (Ri +10) * 3 / 2
Rh + 10 = (20 - Rh) * 3 / 2
Rh + 10 = 30 - 3Rh / 2
5Rh / 2 = 20
Rh = 40 / 5 = 8
Re: maths help- urgent
Posted: Mon Apr 09, 2012 5:48 pm
by Guest55
Algebra really doesn't help with these questions - the first method posted is easier to understand.
Re: maths help- urgent
Posted: Mon Apr 09, 2012 6:12 pm
by Jehan
Thank you everybody for replying. I appreciate it. I am new to this and am reading these forums with growing fascination (and terror!).