PSLEThe pie charts show the number of each type of stationery in 2 stationery boxes, R and S. The total number of stationery in Box R is four times the total number of stationery in Box S.
- Find the percentage of post-it pads in Box R.
- What fraction of stationery in Box S is post-it pads?
- The number of post-it pads in Box R is 180. Find the number of post-it pads in Box S.
(a)
90°360° = 25% of stationery in Box R
Percentage of glues in Box R = 25%
Percentage of post-it pads in Box R
= 100% - 30% - 25%
= 45%
(b)
Percentage of post-it pads in Box S
= 100% - 50% - 15%
= 35%
Fraction of stationery in Box S that is post-it pads
= 35100
=
720 (c)
45% of stationery in Box R = 180
1% of stationery in Box R = 180 ÷ 45 = 4
100% of the stationery in Box R = 100 x 4 = 400
Number of stationery in Box S
= 400 ÷ 4
= 100
100% of stationery in Box S = 100
1% of stationery in Box R = 100 ÷ 100 = 1
35% of stationery in Box R = 35 x 1 = 35
Number of post-it pads in Box S = 35
Answer(s): (a) 45%; (b)
720; (c) 35