PSLEThe pie charts show the number of each type of stationery in 2 stationery boxes, M and N. The total number of stationery in Box M is four times the total number of stationery in Box N.
- Find the percentage of pencils in Box M.
- What fraction of stationery in Box N is pencils?
- The number of pencils in Box M is 160. Find the number of pencils in Box N.
(a)
90°360° = 25% of stationery in Box M
Percentage of punchers in Box M = 25%
Percentage of pencils in Box M
= 100% - 35% - 25%
= 40%
(b)
Percentage of pencils in Box N
= 100% - 75% - 15%
= 10%
Fraction of stationery in Box N that is pencils
= 10100
=
110 (c)
40% of stationery in Box M = 160
1% of stationery in Box M = 160 ÷ 40 = 4
100% of the stationery in Box M = 100 x 4 = 400
Number of stationery in Box N
= 400 ÷ 4
= 100
100% of stationery in Box N = 100
1% of stationery in Box M = 100 ÷ 100 = 1
10% of stationery in Box M = 10 x 1 = 10
Number of pencils in Box N = 10
Answer(s): (a) 40%; (b)
110; (c) 10