Hello,
This is question 19 in mixed questions practice set 3 on page 205 of the Quantitative reasoning book.
In a factory, machine A operates on a cycle of 20 hours of work followed by
4 hours of rest, and machine B operates on a cycle of 40 hours of work followed
by 8 hours of rest. Last week, the two machines began their respective cycles at
12 noon on Monday and continued until 12 noon on the following Saturday.
On which days during that time period was there a time when both machines
were at rest?
Indicate all such days.
A Monday
B Tuesday
C Wednesday
D Thursday
E Friday
F Saturday
I tried to factorize but that didnt work. Any help on how to do this?