In a box, 30% of the buttons are purple, 18% are blue and the rest are black
- What fraction of the buttons is black? Give your answer in the simplest form.
- There are 416 black buttons in the box. How many buttons are there in the box altogether?
(a)
Percentage of buttons that are black
= 100% - 30% - 18%
= 52%
Fraction of buttons that are black
=
52100 =
1325 (b)
Number of black buttons = 13 u
13 u = 416
1 u = 416 ÷ 13 = 32
Total number of buttons
= 25 u
= 25 x 32
= 800
Answer(s): (a)
1325; (b) 800