PSLE The bar graph shows the number of markers sold from Jul to Sep. The number of markers sold is not shown on the scale.
- What was the percentage increase in the number of markers sold from Jul to Aug?
- There were 112 less markers sold in Jul than in Sep. How many markers were sold in Jul?
- The average number of markers sold from Jul to Nov was 136. What was the average number of markers sold in Oct and Nov?
(a)
Percentage increase in the number of markers 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 markers sold in Jul
= 2 intervals
= 2 x 14
= 28
(c)
Total intervals from Jul to Sep
= 2 + 5 + 10
= 17
Total number of markers sold from Jul to Sep
= 17 intervals
= 17 x 14
= 238
Total number of markers sold from Jul to Nov
= 5 x 136
= 680
Number of markers sold from Oct to Nov
= 680 - 238
= 442
Average number of markers sold in Oct and Nov
= 442 ÷ 2
= 221
Answer(s): (a) 150%; (b) 28; (c) 221