Question

A stationary shop orders a batch of pens from a factory.

The factory could make the batch of pens in 20 days using 12 machines.
Due to a fault, only 3 machines were used for the first 8 days.
All 12 machines were used from day 9 onwards.
Work out the total number of days taken to make the batch of pens

Answer 1

22

Explanation:

(8 + 20) - ((8 * 9) ÷ 12)

Using PEMDAS, let us find the product to get;

(8 + 20) - (72/12)

Next operation is to divide what is in the bracket to get:

(8 + 20) - 6

Next operation is addition of the bracket content to get; 28 - 6

Next operation is to carry out subtraction to get: 22

Thus, the total number of days taken to make the batch of pens is 22.