There are 195 beads in a box. 0.4 of them are green beads, and the rest are red and black beads. If there are 18 as many red beads as black beads. How many black beads are there?
| Green beads |
Red beads |
Black beads |
Total |
| 2 u |
3 u |
5 u |
| |
1 p |
8 p |
|
0.4 =
410 =
25 Fraction of beads that are red and black beads
= 1 -
25 =
35 Total number of beads = 5 u
5 u = 195
1 u = 195 ÷ 5 = 39
Number of red beads and black beads
= 3 u
= 3 x 39
= 117
Number of red and black beads
= 1 p + 8 p
= 9 p
9 p = 117
1 p = 117 ÷ 9 = 13
Number of black beads
= 8 p
= 8 x 13
= 104
Answer(s): 104
