PSLE The bar graph shows the number of punchers sold from Jul to Sep. The number of punchers sold is not shown on the scale.
- What was the percentage decrease in the number of punchers sold from Aug to Sep?
- There were 133 more punchers sold in Sep than in Jul. How many punchers were sold in Aug?
- The average number of punchers sold from Jul to Nov was 165. What was the average number of punchers sold in Oct and Nov?
(a)
Percentage decrease in the number of punchers from Aug to Sep
=
10 - 810 x 100%
=
210 x 100%
= 20%
(b)
Difference in the number of intervals between Sep and Jul
= 8 - 1
= 7
7 intervals → 133
1 interval → 133 ÷ 7 = 19
Number of punchers sold in Aug
= 10 intervals
= 10 x 19
= 190
(c)
Total intervals from Jul to Sep
= 1 + 10 + 8
= 19
Total number of punchers sold from Jul to Sep
= 19 intervals
= 19 x 19
= 361
Total number of punchers sold from Jul to Nov
= 5 x 165
= 825
Number of punchers sold from Oct to Nov
= 825 - 361
= 464
Average number of punchers sold in Oct and Nov
= 464 ÷ 2
= 232
Answer(s): (a) 20%; (b) 190; (c) 232