PSLE The bar graph shows the number of storybooks read by a class from June to September. The number of storybooks read in June is not shown.
- What was the percentage decrease in the number of storybooks read from August to September?
- The average number of books read in a month from June to September was 85. How many books did the class read in June?
(a)
One interval = 1 u
Decrease in the number of storybook reads from August to September
= 10 u - 7 u
= 3 u
Percentage increase in the number of storybooks read from from August to September
=
310 x 100%
= 30%
(b)
Total number of storybooks read from June to September
= 4 x 85
= 340
Number of storybooks read from July to September
= 100 + 100 + 70
= 270
Number of storybooks read in June
= 340 - 270
= 70
Answer(s): (a) 30%; (b) 70