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# If the number of red marbles is increased by 20%

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VP
Joined: 31 Oct 2013
Posts: 1003
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
If the number of red marbles is increased by 20%  [#permalink]

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28 Jan 2018, 04:19
00:00

Difficulty:

35% (medium)

Question Stats:

91% (02:32) correct 9% (03:12) wrong based on 34 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
Intern
Joined: 04 Jan 2018
Posts: 37
Re: If the number of red marbles is increased by 20%  [#permalink]

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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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Manager
Joined: 24 Jun 2013
Posts: 132
Location: India
Schools: ISB '20
Re: If the number of red marbles is increased by 20%  [#permalink]

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

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

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