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 By: JessicaTan (offline)  Tuesday, October 16 2012 @ 02:44 AM CDT (Read 980 times)
JessicaTan

pls help with working solution.

10) Brent bought a packet of blue, red and green marbles. 45% of the marbles were blue. The rest of the red and green marbles were in the ratio 1 : 4 respectively. There were 66 more green marbles than red marbles. How many marbles did Brent buy?
(ans : 200)

thanks
Jessica

Regular Member

Registered: 10/17/09
Posts: 82

 By: jessie_nol (offline)  Wednesday, October 17 2012 @ 11:03 AM CDT
jessie_nol

Blue = 45%
Remaining % = 100 - 45 = 55%
Red = 1/5 x 55 = 11%
Green = 55% - 11% = 44%

Differences between Green and Red = 66 marbles
% difference between Green and Red = 44% - 11% = 33%
1% = 66 div 33 = 2 marbles

100 % = 2 x 100% = 200 marbles <-- answer.

Newbie

Registered: 10/17/12
Posts: 2

 By: JessicaTan (offline)  Thursday, October 18 2012 @ 07:28 AM CDT
JessicaTan

Thanks for your help jessie

Rdg
Jessica

Regular Member

Registered: 10/17/09
Posts: 82

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