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In a Mathematics exam. a student scored 30% marks in the

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In a Mathematics exam. a student scored 30% marks in the [#permalink] New post 09 Oct 2003, 10:14
In a Mathematics exam. a student scored 30% marks in the first paper, out of a total of 180. How much should he score in second paper out of a total of 150 ,if he is to get an overall average of atleast 50% ?
A. 74%
B. 70%
C. 76%
D. 80%
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 [#permalink] New post 09 Oct 2003, 11:11
Right !!
how did u work out?? Explain.
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 [#permalink] New post 02 Jan 2004, 20:28
Average = total score / number of tests

total score = 180 + 150 = 330
50% average = 330 * 0.5 = 165 ( he needs to score this )
He has scored 30% in the first test with 180 marks
so he has already scored 0.3 * 180 = 54
Now He needs to score 165-54 = 111 in the second test.
So the precentage = 111/150 = 74
( 0.74 * 150 = 74 * 1.5 = 74 + 74/2 = 74 + 37 = 111 )
  [#permalink] 02 Jan 2004, 20:28
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