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 p6 Nanhua ca1 2011 maths paper
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By: thayal (offline)  Sunday, February 19 2012 @ 07:29 AM CST (Read 1452 times)  
thayal

Hi
pls I need help to solve this question.

I have some red and blue ribbons in a bottle. If I add in 20 red ribbons, 60% of my ribbons are blue. If I add in another 60 blue ribbons, 75% of my ribbons are blue. How many ribbons have I in the bottle?

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By: LeowML (offline)  Wednesday, February 22 2012 @ 11:37 PM CST  
LeowML

At first,
Red ribbon 40% (2u) x 1 = 2u
Blue ribbon 60% (3u) x 1 = 3u

End,
Red ribbon 25% (1u) x 2 = 2u
Blue ribbon 75% (3u) x 2 = 6u

Blue ribbon increase by 3u which is equivalent to 60 ribbons
Therefore, 1u = 20

Total ribbons in the bottle = 2 x 20 + 3 x 20 - 20
= 80

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