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The ratio of red and black marbles in a jar is 3:5. If the number of

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Joined: 31 Oct 2013
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Concentration: Accounting, Finance
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The ratio of red and black marbles in a jar is 3:5. If the number of  [#permalink]

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28 Jan 2018, 05:19
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92% (02:11) correct 8% (02:48) wrong based on 39 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
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Joined: 04 Jan 2018
Posts: 37
Re: The ratio of red and black marbles in a jar is 3:5. If the number of  [#permalink]

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28 Jan 2018, 05:43
1
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

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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Joined: 24 Jun 2013
Posts: 145
Location: India
Schools: ISB '20, GMBA '20
Re: The ratio of red and black marbles in a jar is 3:5. If the number of  [#permalink]

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28 Jan 2018, 05:52
1
R/B=3/5
1.2R/(B+5) = 3/5

6R=5R+15
R=15
B
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Re: The ratio of red and black marbles in a jar is 3:5. If the number of  [#permalink]

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01 Aug 2019, 04:00
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Re: The ratio of red and black marbles in a jar is 3:5. If the number of   [#permalink] 01 Aug 2019, 04:00
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