PSLE
The bar graph shows the number of glues sold from Jan to Mar. The number of glues sold is not shown on the scale.

1. What was the percentage decrease in the number of glues sold from Jan to Feb?
2. There were 52 more glues sold in Mar than in Jan. How many glues were sold in Mar?
3. The average number of glues sold from Jan to May was 121. What was the average number of glues sold in Apr and May?

(a)
Percentage decrease in the number of glues from Jan to Feb
= ^{5 - 3}₅ x 100%
= ²₅ x 100%
= 40%

(b)
Difference in the number of intervals between Mar and Jan
= 9 - 5
= 4

4 intervals → 52

1 interval → 52 ÷ 4 = 13

Number of glues sold in Mar
= 9 intervals
= 9 x 13
= 117

(c)
Total intervals from Jan to Mar
= 5 + 3 + 9
= 17

Total number of glues sold from Jan to Mar
= 17 intervals
= 17 x 13
= 221

Total number of glues sold from Jan to May
= 5 x 121
= 605

Number of glues sold from Apr to May
= 605 - 221
= 384

Average number of glues sold in Apr and May
= 384 ÷ 2
= 192

Answer(s): (a) 40%; (b) 117; (c) 192