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If the number of red marbles is increased by 20%

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Intern
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Joined: 31 Oct 2013
Posts: 10
If the number of red marbles is increased by 20% [#permalink]

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New post 28 Jan 2018, 04:19
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A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

86% (02:27) correct 14% (05:26) wrong based on 21 sessions

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The ratio of red and black marbles in a jar is 3:5. If the number of red marbles is increased by 20% and the number of black marbles is increased by 5 units then the ratio of red and black marbles remains same. How many red marbles were in the jar?

a)12
b)15
c)24
D)30
e)50
[Reveal] Spoiler: OA
Intern
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Joined: 04 Jan 2018
Posts: 30
Re: If the number of red marbles is increased by 20% [#permalink]

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New post 28 Jan 2018, 04:43
selim wrote:
The ratio of red and black marbles in a jar is 3:5. If the number of red marbles is increased by 20% and the number of black marbles is increased by 5 units then the ratio of red and black marbles remains same. How many red marbles were in the jar?

a)12
b)15
c)24
D)30
e)50



Answer is B

let the number of red and black marbles be 3x and 5x.

red marbles increased by 20%==> 3x+ 20% 0f 3x==> 18x/5

black marbles increased by 5==> 5x+5

The ratio is given as same ==> 3:5

(18x/5) 3
---------- = -----
5x+5 5


18x = 15x+15

x=5

red balls=3x =15.

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Don't stop till you get enough

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Joined: 24 Jun 2013
Posts: 29
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Re: If the number of red marbles is increased by 20% [#permalink]

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New post 28 Jan 2018, 04:52
R/B=3/5
1.2R/(B+5) = 3/5

6R=5R+15
R=15
B
Re: If the number of red marbles is increased by 20%   [#permalink] 28 Jan 2018, 04:52
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If the number of red marbles is increased by 20%

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