There are 120 marbles in a bag. 0.4 of them are black marbles, and the rest are green and yellow marbles. If there are 17 as many green marbles as yellow marbles. How many yellow marbles are there?
| Black marbles |
Green marbles |
Yellow marbles |
Total |
| 2 u |
3 u |
5 u |
| |
1 p |
7 p |
|
0.4 =
410 =
25 Fraction of marbles that are green and yellow marbles
= 1 -
25 =
35 Total number of marbles = 5 u
5 u = 120
1 u = 120 ÷ 5 = 24
Number of green marbles and yellow marbles
= 3 u
= 3 x 24
= 72
Number of green and yellow marbles
= 1 p + 7 p
= 8 p
8 p = 72
1 p = 72 ÷ 8 = 9
Number of yellow marbles
= 7 p
= 7 x 9
= 63
Answer(s): 63
