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Avi worked

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by sanju09 » Tue Mar 03, 2009 5:21 am
Avi worked for three straight hours solving GMAT questions. He solved 30 questions in the third hour, which was 2½ times the number of questions he solved in the second hour, and three times the number he solved during the first hour. How many questions did he solve in all?

A. 46
B. 48
C. 52
D. 56
E. 156
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by bluementor » Tue Mar 03, 2009 5:34 am
No of questions in the 1st hour = x
No of questions in the 2nd hour = y
No of questions in the 3rd hour = z

z=30
z = 2.5y
z = 3x

x + y + z
=z/3 + z/2.5 + z
=z + 11z/15
=26z/15
=26(30)/15
=52

Choose C.

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Re: Avi worked

by marcusking » Tue Mar 03, 2009 7:30 am
sanju09 wrote:Avi worked for three straight hours solving GMAT questions. He solved 30 questions in the third hour, which was 2½ times the number of questions he solved in the second hour, and three times the number he solved during the first hour. How many questions did he solve in all?

A. 46
B. 48
C. 52
D. 56
E. 156
30 for third hour
10 for first hour (1/3 of 30)
12 for second hours (30/2.5)

Total of 52 questions
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