MathRevolution wrote:

[GMAT math practice question]

In a pin factory, it needs to produce 100,000 pins every day, and 5 machines take x hours to produce 100,000 pins. One day, one of the machines is out of order, so only 4 machines worked. These four machines took x+2 hours to produce 100,000 pins, and each machine’s work rates are the same. What is the value of x?

A. 5

B. 6

C. 7

D. 8

E. 9

If 5 machines take x hours to produce 100000 pins and if

one of the machine is out of order, the machines will take

x+2 hours to complete the same work

So, 5x = 4(x+2)

5x = 4x + 8

x = 8

Hence, the value of x is

8(Option D)
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