There are 135 marbles in a box. 0.2 of them are green marbles, and the rest are pink and red marbles. If there are 18 as many pink marbles as red marbles. How many red marbles are there?
Green marbles |
Pink marbles |
Red marbles |
Total |
1 u |
4 u |
5 u |
|
1 p |
8 p |
|
0.2 =
210 =
15 Fraction of marbles that are pink and red marbles
= 1 -
15 =
45 Total number of marbles = 5 u
5 u = 135
1 u = 135 ÷ 5 = 27
Number of pink marbles and red marbles
= 4 u
= 4 x 27
= 108
Number of pink and red marbles
= 1 p + 8 p
= 9 p
9 p = 108
1 p = 108 ÷ 9 = 12
Number of red marbles
= 8 p
= 8 x 12
= 96
Answer(s): 96