PSLEThe pie charts show the number of each type of stationery in 2 stationery boxes, B and C. The total number of stationery in Box B is thrice the total number of stationery in Box C.
- Find the percentage of pencils in Box B.
- What fraction of stationery in Box C is pencils?
- The number of pencils in Box B is 270. Find the number of pencils in Box C.
(a)
90°360° = 25% of stationery in Box B
Percentage of correction tapes in Box B = 25%
Percentage of pencils in Box B
= 100% - 30% - 25%
= 45%
(b)
Percentage of pencils in Box C
= 100% - 75% - 15%
= 10%
Fraction of stationery in Box C that is pencils
= 10100
=
110 (c)
45% of stationery in Box B = 270
1% of stationery in Box B = 270 ÷ 45 = 6
100% of the stationery in Box B = 100 x 6 = 600
Number of stationery in Box C
= 600 ÷ 3
= 200
100% of stationery in Box C = 200
1% of stationery in Box B = 200 ÷ 100 = 2
10% of stationery in Box B = 10 x 2 = 20
Number of pencils in Box C = 20
Answer(s): (a) 45%; (b)
110; (c) 20