A factory makes around 5000 energy-saving lightbulbs every month, and the defects are removed by a quality control expert.
There were 16 defects in January, 17 in February, and 27 in March.
The next three months produced the same total number of defects as the first three months.
However, each of April, May, and June produced the same number of defects.
How many defects were there in April?
To find the total number of defects in the first three months, we add up the defects in January, February, and March:
16 + 17 + 27 = 60 defects
Since the next three months produced the same total number of defects, we know that April, May, and June each had 60/3 = 20 defects.
Therefore, there were 20 defects in April.