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 files in Box M.
- What fraction of stationery in Box N is files?
- The number of files in Box M is 140. Find the number of files in Box N.
(a)
90°360° = 25% of stationery in Box M
Percentage of foolscaps in Box M = 25%
Percentage of files in Box M
= 100% - 40% - 25%
= 35%
(b)
Percentage of files in Box N
= 100% - 65% - 15%
= 20%
Fraction of stationery in Box N that is files
= 20100
=
15 (c)
35% of stationery in Box M = 140
1% of stationery in Box M = 140 ÷ 35 = 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
20% of stationery in Box M = 20 x 1 = 20
Number of files in Box N = 20
Answer(s): (a) 35%; (b)
15; (c) 20