There are 150 marbles in a bag. 0.4 of them are purple marbles, and the rest are gold and white marbles. If there are 15 as many gold marbles as white marbles. How many white marbles are there?
| Purple marbles |
Gold marbles |
White marbles |
Total |
| 2 u |
3 u |
5 u |
| |
1 p |
5 p |
|
0.4 =
410 =
25 Fraction of marbles that are gold and white marbles
= 1 -
25 =
35 Total number of marbles = 5 u
5 u = 150
1 u = 150 ÷ 5 = 30
Number of gold marbles and white marbles
= 3 u
= 3 x 30
= 90
Number of gold and white marbles
= 1 p + 5 p
= 6 p
6 p = 90
1 p = 90 ÷ 6 = 15
Number of white marbles
= 5 p
= 5 x 15
= 75
Answer(s): 75
