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Bunuel
A computer factory produces 4200 computers per month at a constant rate, how many computers are built every 30 minutes assuming that there are 28 days in one month?

A. 2.25.
B. 3.125.
C. 4.5.
D. 5.225.
E. 6.25.

In 30 minutes the factory will produce= 4200/ (28*24*2)= 3. ----

B is the answer
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Bunuel
A computer factory produces 4200 computers per month at a constant rate, how many computers are built every 30 minutes assuming that there are 28 days in one month?

A. 2.25.
B. 3.125.
C. 4.5.
D. 5.225.
E. 6.25.

Rate = 4200 comp/month

Required : Production in 30 minutes

Therefore, 4200/(24*28*60) comp/minutes

0.104 comp/minute

So, in 30 minutes = 0.104 * 30

= 3.125

(B)
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Bunuel
A computer factory produces 4200 computers per month at a constant rate, how many computers are built every 30 minutes assuming that there are 28 days in one month?

A. 2.25.
B. 3.125.
C. 4.5.
D. 5.225.
E. 6.25.

There are 24 hours in a day and 2 thirty-minute intervals in an hour, thus there 28 x 24 x 2 = 28 x 48 thirty-minute intervals in a month.

So the number of computers built every 30 minutes is:

4200/(28 x 48) = (6 x 7 x 4 x 25)/(7 x 4 x 6 x 8) = 25/8 = 3.125.

Answer: B
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