In a box, 45% of the erasers are green, 13% are silver and the rest are black
- What fraction of the erasers is black? Give your answer in the simplest form.
- There are 420 black erasers in the box. How many erasers are there in the box altogether?
(a)
Percentage of erasers that are black
= 100% - 45% - 13%
= 42%
Fraction of erasers that are black
=
42100 =
2150 (b)
Number of black erasers = 21 u
21 u = 420
1 u = 420 ÷ 21 = 20
Total number of erasers
= 50 u
= 50 x 20
= 1000
Answer(s): (a)
2150; (b) 1000