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Need helpppp

by sohaib_iba » Wed Jun 02, 2010 5:21 am
Adnan scores 45% of the marks in an exam and passes by 5 marks. Taimur scores 48% of the marks in the same exam and passes by 32 marks. what is the number of marks necessary to pass the exam?

A) 200
B) 400
C) 450
D) 600
E) 900
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by liferocks » Wed Jun 02, 2010 5:25 am
so 48-45=3% of the marks is 32-5 or 27
hence 45%= 27*45/3=9*45=405

so pass marks is 405-5=400

Ans option B
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by selango » Wed Jun 02, 2010 5:42 am
Let x be mark obtained and y be pass mark

45/100*x=y+5

48/100*x=Y+32

->3/100*x=27

x=900

y+5=45/100*900

y+5=405->y=400

option B
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