There are 200 beads in a box. 0.1 of them are pink beads, and the rest are red and purple beads. If there are 18 as many red beads as purple beads. How many purple beads are there?
| Pink beads |
Red beads |
Purple beads |
Total |
| 1 u |
9 u |
10 u |
| |
1 p |
8 p |
|
0.1 =
110 =
110 Fraction of beads that are red and purple beads
= 1 -
110 =
910 Total number of beads = 10 u
10 u = 200
1 u = 200 ÷ 10 = 20
Number of red beads and purple beads
= 9 u
= 9 x 20
= 180
Number of red and purple beads
= 1 p + 8 p
= 9 p
9 p = 180
1 p = 180 ÷ 9 = 20
Number of purple beads
= 8 p
= 8 x 20
= 160
Answer(s): 160
