PSLE The bar graph shows the number of post-it pads sold from Jan to Mar. The number of post-it pads sold is not shown on the scale.
- What was the percentage decrease in the number of post-it pads sold from Jan to Feb?
- There were 76 more post-it pads sold in Mar than in Jan. How many post-it pads were sold in Mar?
- The average number of post-it pads sold from Jan to May was 165. What was the average number of post-it pads sold in Apr and May?
(a)
Percentage decrease in the number of post-it pads from Jan to Feb
=
5 - 35 x 100%
=
25 x 100%
= 40%
(b)
Difference in the number of intervals between Mar and Jan
= 9 - 5
= 4
4 intervals → 76
1 interval → 76 ÷ 4 = 19
Number of post-it pads sold in Mar
= 9 intervals
= 9 x 19
= 171
(c)
Total intervals from Jan to Mar
= 5 + 3 + 9
= 17
Total number of post-it pads sold from Jan to Mar
= 17 intervals
= 17 x 19
= 323
Total number of post-it pads sold from Jan to May
= 5 x 165
= 825
Number of post-it pads sold from Apr to May
= 825 - 323
= 502
Average number of post-it pads sold in Apr and May
= 502 ÷ 2
= 251
Answer(s): (a) 40%; (b) 171; (c) 251