There are 108 marbles in a basket. 0.5 of them are yellow marbles, and the rest are black and brown marbles. If there are 18 as many black marbles as brown marbles. How many brown marbles are there?
| Yellow marbles |
Black marbles |
Brown marbles |
Total |
| 1 u |
1 u |
2 u |
| |
1 p |
8 p |
|
0.5 =
510 =
12 Fraction of marbles that are black and brown marbles
= 1 -
12 =
12 Total number of marbles = 2 u
2 u = 108
1 u = 108 ÷ 2 = 54
Number of black marbles and brown marbles
= 1 u
= 1 x 54
= 54
Number of black and brown marbles
= 1 p + 8 p
= 9 p
9 p = 54
1 p = 54 ÷ 9 = 6
Number of brown marbles
= 8 p
= 8 x 6
= 48
Answer(s): 48
