PSLE The bar graph shows the number of glues sold from Jul to Sep. The number of glues sold is not shown on the scale.
- What was the percentage increase in the number of glues sold from Jul to Aug?
- There were 80 less glues sold in Jul than in Sep. How many glues were sold in Jul?
- The average number of glues sold from Jul to Nov was 138. What was the average number of glues sold in Oct and Nov?
(a)
Percentage increase in the number of glues 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 → 80
1 interval → 80 ÷ 8 = 10
Number of glues sold in Jul
= 2 intervals
= 2 x 10
= 20
(c)
Total intervals from Jul to Sep
= 2 + 5 + 10
= 17
Total number of glues sold from Jul to Sep
= 17 intervals
= 17 x 10
= 170
Total number of glues sold from Jul to Nov
= 5 x 138
= 690
Number of glues sold from Oct to Nov
= 690 - 170
= 520
Average number of glues sold in Oct and Nov
= 520 ÷ 2
= 260
Answer(s): (a) 150%; (b) 20; (c) 260