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# In a group of 60 workers, the average salary is \$80 a day per worker.

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Math Expert
Joined: 02 Sep 2009
Posts: 55670
In a group of 60 workers, the average salary is \$80 a day per worker.  [#permalink]

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07 Jan 2019, 05:23
00:00

Difficulty:

35% (medium)

Question Stats:

72% (01:48) correct 28% (01:44) wrong based on 35 sessions

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In a group of 60 workers, the average salary is \$80 a day per worker. If some of the workers earn \$75 a day and all the rest earn \$100 a day, how many workers earn \$75 a day?

A. 12
B. 24
C. 36
D. 48
E. 54

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Re: In a group of 60 workers, the average salary is \$80 a day per worker.  [#permalink]

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07 Jan 2019, 05:36
Bunuel wrote:
In a group of 60 workers, the average salary is \$80 a day per worker. If some of the workers earn \$75 a day and all the rest earn \$100 a day, how many workers earn \$75 a day?

A. 12
B. 24
C. 36
D. 48
E. 54

total salary = 80*60 = 4800\$

so
we can say 75*x+100* ( 60-x)= 4800
solve for x
x=48 IMO D
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Joined: 16 Dec 2018
Posts: 10
Re: In a group of 60 workers, the average salary is \$80 a day per worker.  [#permalink]

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08 Jan 2019, 00:31
75*x+100* ( 60-x)= 4800
By solving we get x=48(D)

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Re: In a group of 60 workers, the average salary is \$80 a day per worker.   [#permalink] 08 Jan 2019, 00:31
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