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03 Oct 2019, 01:57
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
87% (01:53) correct
13%
(03:02)
wrong
based on 75
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Not Attempted Yet
Inside an urn, the ratio of red to blue marbles is 3:8, and the ratio of blue to green marbles is 5:8. If the sum of red, green, and blue marbles is 238, how many of the marbles are green?
A. 30
B. 64
C. 80
D. 128
E. 208
A. 30
B. 64
C. 80
D. 128
E. 208
03 Oct 2019, 03:23
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\(\frac{R}{B}\) = \(\frac{3}{8}\)----\(\frac{B}{G}\) = \(\frac{5}{8}\)
R : B : G = 3*5 : 8*5 : 8*8 = 15 : 40 : 64
let R = 15x
then B = 40x and G = 64x
R+B+G = 238
15x+40x+64x = 238
119x = 238
x = 2
GREEN = 64x = 64*2 = 128
D is the answer
R : B : G = 3*5 : 8*5 : 8*8 = 15 : 40 : 64
let R = 15x
then B = 40x and G = 64x
R+B+G = 238
15x+40x+64x = 238
119x = 238
x = 2
GREEN = 64x = 64*2 = 128
D is the answer
Archit3110
03 Oct 2019, 04:25
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Bunuel
R:B:G
3:8:
:5:8
15:40:64
total sum ; 119x = 238
x= 2
green 64x ; 128
IMO D
