BTGmoderatorLU wrote: ↑

Sun Mar 01, 2020 5:48 am

Source: GMAT Paper Tests

Machine A produces 100 parts twice as fast as Machine B does. Machine B produces 100 parts in 40 minutes. If each machine produces parts at a constant rate, how many parts does Machine A produce in 6 minutes?

A. 30
B. 25
C. 20
D. 15
E. 7.5

The OA is A

Given that Machine B produces 100 parts in 40 minutes, we have Machine A produces 100 parts in 40/2 = 20 minutes.

Thus, Machine A produces in 6 minutes = (100/20)*6 = 30 parts

The correct answer: A

Hope this helps!

-Jay
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BTGmoderatorLU wrote: ↑

Sun Mar 01, 2020 5:48 am

Source: GMAT Paper Tests

Machine A produces 100 parts twice as fast as Machine B does. Machine B produces 100 parts in 40 minutes. If each machine produces parts at a constant rate, how many parts does Machine A produce in 6 minutes?

A. 30
B. 25
C. 20
D. 15
E. 7.5

The OA is A

We can see that the rate of Machine B = 100/40 = 5/2 parts per minute. Since Machine A is twice as fast as Machine B, the rate of Machine A = 5/2 x 2 = 5 parts per minute.

Thus, in 6 minutes, Machine A can produce 5 x 6 = 30 parts.

Answer: A