Tom and Mark had 50 mochi balls each. Tom gave 20% of his mochi balls to Mark. After receiving the mochi balls from Tom, Mark gave 50% of his total mochi balls to Nicole. How many mochi balls had Mark left?
| |
Tom |
Mark |
Nicole |
| Before |
100% |
100% |
|
| Change 1 |
- 20% |
+ 20% |
|
| After 1 |
80% |
120% |
|
| Change 2 |
|
- 60% |
+ 60% |
| After 2 |
|
60% |
|
Percentage of mochi balls after Mark received from Tom
= 100% + 20%
= 120%
Percentage of Mark's mochi balls that Nicole had after receiving from Mark
= 50% x 120%
=
50100 x 120%
= 60%
Percentage of mochi balls that Mark had left after giving to Nicole
= 120% - 60%
= 60%
100% = 50
Number of mochi balls that Mark had left
= 60% x 50
=
60100 x 50
= 30
Answer(s): 30
