There are 150 marbles in a box. 0.4 of them are blue marbles, and the rest are silver and green marbles. If there are 18 as many silver marbles as green marbles. How many green marbles are there?
| Blue marbles |
Silver marbles |
Green marbles |
Total |
| 2 u |
3 u |
5 u |
| |
1 p |
8 p |
|
0.4 =
410 =
25 Fraction of marbles that are silver and green marbles
= 1 -
25 =
35 Total number of marbles = 5 u
5 u = 150
1 u = 150 ÷ 5 = 30
Number of silver marbles and green marbles
= 3 u
= 3 x 30
= 90
Number of silver and green marbles
= 1 p + 8 p
= 9 p
9 p = 90
1 p = 90 ÷ 9 = 10
Number of green marbles
= 8 p
= 8 x 10
= 80
Answer(s): 80
