PSLEThe pie charts show the number of each type of stationery in 2 stationery boxes, S and T. The total number of stationery in Box S is four times the total number of stationery in Box T.
- Find the percentage of rulers in Box S.
- What fraction of stationery in Box T is rulers?
- The number of rulers in Box S is 160. Find the number of rulers in Box T.
(a)
90°360° = 25% of stationery in Box S
Percentage of highlighters in Box S = 25%
Percentage of rulers in Box S
= 100% - 55% - 25%
= 20%
(b)
Percentage of rulers in Box T
= 100% - 65% - 20%
= 15%
Fraction of stationery in Box T that is rulers
= 15100
=
320 (c)
20% of stationery in Box S = 160
1% of stationery in Box S = 160 ÷ 20 = 8
100% of the stationery in Box S = 100 x 8 = 800
Number of stationery in Box T
= 800 ÷ 4
= 200
100% of stationery in Box T = 200
1% of stationery in Box S = 200 ÷ 100 = 2
15% of stationery in Box S = 15 x 2 = 30
Number of rulers in Box T = 30
Answer(s): (a) 20%; (b)
320; (c) 30