PSLE The bar graph shows the number of storybooks read by a class from April to July. The number of storybooks read in April is not shown.
- What was the percentage decrease in the number of storybooks read from June to July?
- The average number of books read in a month from April to July was 50. How many books did the class read in April?
(a)
One interval = 1 u
Decrease in the number of storybook reads from June to July
= 5 u - 4 u
= 1 u
Percentage increase in the number of storybooks read from from June to July
=
15 x 100%
= 20%
(b)
Total number of storybooks read from April to July
= 4 x 50
= 200
Number of storybooks read from May to July
= 80 + 50 + 40
= 170
Number of storybooks read in April
= 200 - 170
= 30
Answer(s): (a) 20%; (b) 30