There are 170 marbles in a bag. 0.3 of them are green marbles, and the rest are black and brown marbles. If there are 34 as many black marbles as brown marbles. How many brown marbles are there?
| Green marbles |
Black marbles |
Brown marbles |
Total |
| 3 u |
7 u |
10 u |
| |
3 p |
4 p |
|
0.3 =
310 =
310 Fraction of marbles that are black and brown marbles
= 1 -
310 =
710 Total number of marbles = 10 u
10 u = 170
1 u = 170 ÷ 10 = 17
Number of black marbles and brown marbles
= 7 u
= 7 x 17
= 119
Number of black and brown marbles
= 3 p + 4 p
= 7 p
7 p = 119
1 p = 119 ÷ 7 = 17
Number of brown marbles
= 4 p
= 4 x 17
= 68
Answer(s): 68
