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11 Apr 2017, 22:59
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C
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Difficulty:
5%
(low)
Question Stats:
86% (01:30) correct
14%
(01:59)
wrong
based on 108
sessions
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John can mow 7 acres of land in one day, while Sam and John can mow 22 acres in 2 days. How many days did it take Sam to mow 5 acres by himself?
A. 7/22
B. 4/5
C. 5/4
D. 22/7
E. 15
A. 7/22
B. 4/5
C. 5/4
D. 22/7
E. 15
11 Apr 2017, 23:29
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Given that in 2 days Sam & John together mow 22 acres of land.
So, in 1 day they mow = 22/2 = 11 acres of land.
This statement can be written as equation 1/Sam + 1/John = 11
Also it is given that John mows 7 acres of land in 1 day, or we can say 1/John = 7.
Putting the value in above equation we get, 1/Sam + 7 = 11
Solving we get, 1/Sam = 4
So, Sam mows 4 acres of land in 1 day.
To mow 5 acres of land he'll need 5/4 days.
Answer should be C.
So, in 1 day they mow = 22/2 = 11 acres of land.
This statement can be written as equation 1/Sam + 1/John = 11
Also it is given that John mows 7 acres of land in 1 day, or we can say 1/John = 7.
Putting the value in above equation we get, 1/Sam + 7 = 11
Solving we get, 1/Sam = 4
So, Sam mows 4 acres of land in 1 day.
To mow 5 acres of land he'll need 5/4 days.
Answer should be C.
12 Apr 2017, 09:16
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Bunuel
John can mow 7 acres of land in one day, while Sam and John can mow 22 acres in 2 days. How many days did it take Sam to mow 5 acres by himself?
A. 7/22
B. 4/5
C. 5/4
D. 22/7
E. 15
A. 7/22
B. 4/5
C. 5/4
D. 22/7
E. 15
Efficiency of John = 7 acres/day
Efficiency of John + Sam = 11 acres/day
Thus, efficiency of Sam = 4 units/day..
So, time required to mow 5 acres = 5/4 days, answer must be (C)
