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

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New post 28 Jan 2018, 05:19
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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
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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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New post 28 Jan 2018, 05:43
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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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Re: The ratio of red and black marbles in a jar is 3:5. If the number of  [#permalink]

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New post 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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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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