Roshel, Kathy and Erika have 220 marbles. Roshel has
56 as many marbles as Kathy. Erika's marbles is
13 of the total number of Roshel's and Kathy's marbles. How many marbles must Kathy give to Erika so that both Roshel and Erika will have the same number of marbles?
Roshel |
Kathy |
Erika |
Total |
3x11 = 33 u |
1x11 = 11 u |
|
5x3 = 15 u |
6x3 = 18 u |
|
|
15 u |
18 u |
11 u |
220 |
Total number of marbles
= 15 u + 18 u + 11 u
= 44 u
44 u = 220
1 u = 220 ÷ 44 = 5
Roshel |
Kathy |
Erika |
Total |
15 u |
18 u |
11 u |
220 |
|
- 4 u |
+ 4 u |
|
15 u |
14 u |
15 u |
220 |
Number of marbles that Kathy must give to Erika
= 15 u - 11 u
= 4 u
= 4 x 5
= 20
Answer(s): 20