PSLEThe pie charts show the number of each type of stationery in 2 stationery boxes, T and U. The total number of stationery in Box T is four times the total number of stationery in Box U.
- Find the percentage of pencils in Box T.
- What fraction of stationery in Box U is pencils?
- The number of pencils in Box T is 240. Find the number of pencils in Box U.
(a)
90°360° = 25% of stationery in Box T
Percentage of glues in Box T = 25%
Percentage of pencils in Box T
= 100% - 45% - 25%
= 30%
(b)
Percentage of pencils in Box U
= 100% - 45% - 25%
= 30%
Fraction of stationery in Box U that is pencils
= 30100
=
310 (c)
30% of stationery in Box T = 240
1% of stationery in Box T = 240 ÷ 30 = 8
100% of the stationery in Box T = 100 x 8 = 800
Number of stationery in Box U
= 800 ÷ 4
= 200
100% of stationery in Box U = 200
1% of stationery in Box T = 200 ÷ 100 = 2
30% of stationery in Box T = 30 x 2 = 60
Number of pencils in Box U = 60
Answer(s): (a) 30%; (b)
310; (c) 60