When a fifth of the class is absent, there are 24 pupils present. What is the total number of pupils in the class?
Since 1/5 of the class is absent, this must mean that 4/5 of the class is present. We are told that 24 pupils are present, so 4/5 of the class must equal 24 pupils. Now we need to find out how many pupils 1/5 of the class equals. If 4/5 of the class equals 24 pupils, then 1/5 must equal 24 divided by 4. This is because 4/5 divided by 4 is 1/5. Therefore, 1/5 of the class must equal 6 pupils. We then add 6 to 24 to get 30, since 4/5 + 1/5 = total number of pupils in the class.
Answer: There are 30 pupils in the whole class.
AT
Related Maths 11 Plus answers
All answers ▸The average temperature in May is 18 ºC. The average temperature in November is a third of the average temperature in May. The average temperature in September is twice the average temperature in November. What is the average temperature in September?
I’m confused by the difference between using f’(x) and f”(x) to find the minima and maxima of a curve
How do I work out the area of a rectangle
A drawer contains ten identical yellow socks, eight identical blue socks and four identical pink socks. Amrita picks socks from from the drawer without looking. What is the smallest number of socks she must pick to be sure that she has at least two pairs