Yoko had some marble collection.
13 of them were yellow and the rest were white. She gave away 153 of the white marbles and 10% of the yellow marbles. She then had
25 of her marble collection left. How many marbles did Yoko give away?
| |
Yellow |
White |
Total |
Total |
Before
|
1x5 =
5 u |
2x5 =
10 u |
3x5 =
15 u |
5x3 =
15 u |
Change
|
- 0.1x5 =
- 0.5 u |
- 153 |
|
- 3x3 =
- 9 u |
After
|
0.9x5 =
4.5 u |
10 u - 153 |
|
2x3 =
6 u |
The total number of marbles that Yoko had at first is repeated. Make the total number of marbles at first the same. LCM 3 and 5 is 15.
Number of yellow marbles that Yoko gave away
= 10% x 1 u
=
10100 x 1 u
= 0.1 u
0.5 u - 153 = 9 u
9 u - 0.5 u = 153
8.5 u = 153
1 u = 153 ÷ 8.5 = 18
Number of marbles that Yoko gave away
= 9 u
= 9 x 18
= 162
Answer(s): 162
