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19 Feb 2019, 23:53
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D
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Difficulty:
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75% (01:16) correct
25%
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A machine punches x plates per hour for 4 hours and then y plates per hour for 2 hours. Which of the following is an expression for the average number of plates punched per hour by the machine for the entire 6 hours?
A. 2x + 4y
B. (x + 2y)/3
C. 3xy/2
D. (2x + y)/3
E. 4x + 2y
A. 2x + 4y
B. (x + 2y)/3
C. 3xy/2
D. (2x + y)/3
E. 4x + 2y
20 Feb 2019, 00:14
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Answer must be D.
total no of plates = 4x+2y
total hours = 6
so average = (4x+2y)/6 = 2x+y /3
Please award kudos if helpful
Posted from my mobile device
total no of plates = 4x+2y
total hours = 6
so average = (4x+2y)/6 = 2x+y /3
Please award kudos if helpful
Posted from my mobile device
General Discussion
20 Feb 2019, 01:58
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Bunuel
A machine punches x plates per hour for 4 hours and then y plates per hour for 2 hours. Which of the following is an expression for the average number of plates punched per hour by the machine for the entire 6 hours?
A. 2x + 4y
B. (x + 2y)/3
C. 3xy/2
D. (2x + y)/3
E. 4x + 2y
A. 2x + 4y
B. (x + 2y)/3
C. 3xy/2
D. (2x + y)/3
E. 4x + 2y
4x+2y/6
or say
2x+y/ 3
IMO D
