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 Feb to Mar?
- There were 77 more post-it pads sold in Mar than in Jan. How many post-it pads were sold in Feb?
- The average number of post-it pads sold from Jan to May was 131. 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 Feb to Mar
=
10 - 810 x 100%
=
210 x 100%
= 20%
(b)
Difference in the number of intervals between Mar and Jan
= 8 - 1
= 7
7 intervals → 77
1 interval → 77 ÷ 7 = 11
Number of post-it pads sold in Feb
= 10 intervals
= 10 x 11
= 110
(c)
Total intervals from Jan to Mar
= 1 + 10 + 8
= 19
Total number of post-it pads sold from Jan to Mar
= 19 intervals
= 19 x 11
= 209
Total number of post-it pads sold from Jan to May
= 5 x 131
= 655
Number of post-it pads sold from Apr to May
= 655 - 209
= 446
Average number of post-it pads sold in Apr and May
= 446 ÷ 2
= 223
Answer(s): (a) 20%; (b) 110; (c) 223