A music class has an enrolment of 121 pupils. 7/11 of the pupils wear glasses. How many of the pupils do not wear glasses?
To find out how many pupils do not wear glasses, we'll first calculate the number of pupils who do wear glasses and then subtract that number from the total enrollment of 121 pupils.
According to the information given, 7/11 of the pupils wear glasses. So let's calculate that number:
Number of pupils who wear glasses = (7/11) * 121
Now we'll simplify this:
= 7 * (121/11)
= 7 * 11
= 77
So 77 pupils wear glasses.
To get the number of pupils who do not wear glasses, we subtract the number of pupils who wear glasses from the total number of pupils:
Number of pupils who do not wear glasses = Total number of pupils - Number of pupils who wear glasses
= 121 - 77
= 44
Therefore, 44 pupils do not wear glasses.