There are 200 marbles in a bag. 0.4 of them are red marbles, and the rest are blue and gold marbles. If there are 37 as many blue marbles as gold marbles. How many gold marbles are there?
| Red marbles |
Blue marbles |
Gold marbles |
Total |
| 2 u |
3 u |
5 u |
| |
3 p |
7 p |
|
0.4 =
410 =
25 Fraction of marbles that are blue and gold marbles
= 1 -
25 =
35 Total number of marbles = 5 u
5 u = 200
1 u = 200 ÷ 5 = 40
Number of blue marbles and gold marbles
= 3 u
= 3 x 40
= 120
Number of blue and gold marbles
= 3 p + 7 p
= 10 p
10 p = 120
1 p = 120 ÷ 10 = 12
Number of gold marbles
= 7 p
= 7 x 12
= 84
Answer(s): 84
