PSLE The bar graph shows the number of foolscaps sold from Jul to Sep. The number of foolscaps sold is not shown on the scale.
- What was the percentage increase in the number of foolscaps sold from Jul to Aug?
- There were 112 less foolscaps sold in Jul than in Sep. How many foolscaps were sold in Jul?
- The average number of foolscaps sold from Jul to Nov was 146. What was the average number of foolscaps sold in Oct and Nov?
(a)
Percentage increase in the number of foolscaps from Jul to Aug
=
5 - 22 x 100%
=
32 x 100%
= 150%
(b)
Difference in intervals between Sep and Jul
= 10 - 2
= 8
8 intervals → 112
1 interval → 112 ÷ 8 = 14
Number of foolscaps sold in Jul
= 2 intervals
= 2 x 14
= 28
(c)
Total intervals from Jul to Sep
= 2 + 5 + 10
= 17
Total number of foolscaps sold from Jul to Sep
= 17 intervals
= 17 x 14
= 238
Total number of foolscaps sold from Jul to Nov
= 5 x 146
= 730
Number of foolscaps sold from Oct to Nov
= 730 - 238
= 492
Average number of foolscaps sold in Oct and Nov
= 492 ÷ 2
= 246
Answer(s): (a) 150%; (b) 28; (c) 246