There are 100 marbles in a basket. 0.1 of them are yellow marbles, and the rest are gold and white marbles. If there are 18 as many gold marbles as white marbles. How many white marbles are there?
| Yellow marbles |
Gold marbles |
White marbles |
Total |
| 1 u |
9 u |
10 u |
| |
1 p |
8 p |
|
0.1 =
110 =
110 Fraction of marbles that are gold and white marbles
= 1 -
110 =
910 Total number of marbles = 10 u
10 u = 100
1 u = 100 ÷ 10 = 10
Number of gold marbles and white marbles
= 9 u
= 9 x 10
= 90
Number of gold and white marbles
= 1 p + 8 p
= 9 p
9 p = 90
1 p = 90 ÷ 9 = 10
Number of white marbles
= 8 p
= 8 x 10
= 80
Answer(s): 80
