There are 108 marbles in a basket. 0.5 of them are grey marbles, and the rest are purple and brown marbles. If there are 18 as many purple marbles as brown marbles. How many brown marbles are there?
Grey marbles |
Purple marbles |
Brown marbles |
Total |
1 u |
1 u |
2 u |
|
1 p |
8 p |
|
0.5 =
510 =
12 Fraction of marbles that are purple and brown marbles
= 1 -
12 =
12 Total number of marbles = 2 u
2 u = 108
1 u = 108 ÷ 2 = 54
Number of purple marbles and brown marbles
= 1 u
= 1 x 54
= 54
Number of purple 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