maths help- urgent

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rejim2
Posts: 92
Joined: Thu Mar 17, 2011 1:58 pm

maths help- urgent

Post 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,
NorthLondonMum
Posts: 170
Joined: Mon Jun 22, 2009 3:24 pm

Re: maths help- urgent

Post 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?
rejim2
Posts: 92
Joined: Thu Mar 17, 2011 1:58 pm

Re: maths help- urgent

Post by rejim2 »

Thankyou, NorthlondonMum!. Got it.
Jehan
Posts: 7
Joined: Sun Apr 08, 2012 10:55 am

Re: maths help- urgent

Post 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.
hermanmunster
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Joined: Fri Sep 15, 2006 9:51 am
Location: The Seaside

Re: maths help- urgent

Post by hermanmunster »

Because they are adding ten years each to the total
tco
Posts: 37
Joined: Fri Nov 16, 2007 10:49 pm

Re: maths help- urgent

Post 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
Guest55
Posts: 16254
Joined: Mon Feb 12, 2007 2:21 pm

Re: maths help- urgent

Post by Guest55 »

Algebra really doesn't help with these questions - the first method posted is easier to understand.
Jehan
Posts: 7
Joined: Sun Apr 08, 2012 10:55 am

Re: maths help- urgent

Post 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!).
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