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percent of a is equal

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percent of a is equal

by sanju09 » Sat Jun 19, 2010 12:51 am
If 60 percent of a is equal to 120 percent of b, then 2 a - 4 b =?
(A) -360
(B) 0
(C) 0.5 a
(D) 2 a
(E) 3 a
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by amising6 » Sat Jun 19, 2010 1:05 am
sanju09 wrote:If 60 percent of a is equal to 120 percent of b, then 2 a - 4 b =?
(A) -360
(B) 0
(C) 0.5 a
(D) 2 a
(E) 3 a
60% of a=120 %ofb
60/100*a=120/100*b
0.6a=1.2b multiplying by 10 both side
6a=12b
a=2b
a-2b=0
2a-4b=0 (multiplying by 2 both side)

hence answer B
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by kvcpk » Sat Jun 19, 2010 1:08 am
sanju09 wrote:If 60 percent of a is equal to 120 percent of b, then 2 a - 4 b =?
(A) -360
(B) 0
(C) 0.5 a
(D) 2 a
(E) 3 a
"60 percent of a is equal to 120 percent of b" means that a=2b so 2a-4b=0
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