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the original number?

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by sanju09 » Tue Apr 05, 2011 2:02 am
The difference between the value of a number increased by 12 ½ percent and the value of the original number decreased by 25 percent is 30. What is the original number?
(A) 40
(B) 60
(C) 80
(D) 120
(E) 160
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by force5 » Tue Apr 05, 2011 2:26 am
only value possible is 80
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by manpsingh87 » Tue Apr 05, 2011 2:28 am
sanju09 wrote:The difference between the value of a number increased by 12 ½ percent and the value of the original number decreased by 25 percent is 30. What is the original number?
(A) 40
(B) 60
(C) 80
(D) 120
(E) 160
let the original number be x therefore,
1.125x-.75x=30;
.375x=30
x=80;
hence C
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by Anurag@Gurome » Tue Apr 05, 2011 2:28 am
sanju09 wrote:The difference between the value of a number increased by 12 ½ percent and the value of the original number decreased by 25 percent is 30. What is the original number?
(A) 40
(B) 60
(C) 80
(D) 120
(E) 160
Let original number = N
(N + 0.125N) - (N - 0.25N) = 30
0.375N = 30 implies N = 80
The correct answer is C.
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