There are 200 marbles in a box. 0.2 of them are green marbles, and the rest are blue and white marbles. If there are 17 as many blue marbles as white marbles. How many white marbles are there?
| Green marbles |
Blue marbles |
White marbles |
Total |
| 1 u |
4 u |
5 u |
| |
1 p |
7 p |
|
0.2 =
210 =
15 Fraction of marbles that are blue and white marbles
= 1 -
15 =
45 Total number of marbles = 5 u
5 u = 200
1 u = 200 ÷ 5 = 40
Number of blue marbles and white marbles
= 4 u
= 4 x 40
= 160
Number of blue and white marbles
= 1 p + 7 p
= 8 p
8 p = 160
1 p = 160 ÷ 8 = 20
Number of white marbles
= 7 p
= 7 x 20
= 140
Answer(s): 140
