The number of doctors who uses floss is 32 from a total of 40 doctors. This is because it is given that 8 out of 10 doctors use floss.
Given condition:
Total number of doctors=40
Doctors who use floss per 10 members=8
Calculation:
Since there are 40 doctors, there exist 4 groups and each group has 10 doctors.
It is given that per 10 doctors, 8 of them use floss. So, here 4 groups with every 10 doctors are available.
Thus,
On multiplying,
8 × 4 = 32
Therefore, 32 doctors among 40 doctors use floss.
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