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

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Senior Manager
Joined: 30 Aug 2003
Posts: 322
Location: dallas , tx
In a Mathematics exam. a student scored 30% marks in the [#permalink]

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09 Oct 2003, 10:14
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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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shubhangi

Senior Manager
Joined: 30 Aug 2003
Posts: 322
Location: dallas , tx

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09 Oct 2003, 11:11
Right !!
how did u work out?? Explain.
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shubhangi

SVP
Joined: 30 Oct 2003
Posts: 1790
Location: NewJersey USA

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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 )
02 Jan 2004, 20:28
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