There are 190 marbles in a basket. 0.5 of them are purple marbles, and the rest are black and grey marbles. If there are 14 as many black marbles as grey marbles. How many grey marbles are there?
| Purple marbles |
Black marbles |
Grey marbles |
Total |
| 1 u |
1 u |
2 u |
| |
1 p |
4 p |
|
0.5 =
510 =
12 Fraction of marbles that are black and grey marbles
= 1 -
12 =
12 Total number of marbles = 2 u
2 u = 190
1 u = 190 ÷ 2 = 95
Number of black marbles and grey marbles
= 1 u
= 1 x 95
= 95
Number of black and grey marbles
= 1 p + 4 p
= 5 p
5 p = 95
1 p = 95 ÷ 5 = 19
Number of grey marbles
= 4 p
= 4 x 19
= 76
Answer(s): 76
