Ivan and David had 20 sweets each. Ivan gave 20% of his sweets to David. After receiving the sweets from Ivan, David gave 50% of his total sweets to Tammy. How many sweets had David left?
| |
Ivan |
David |
Tammy |
| Before |
100% |
100% |
|
| Change 1 |
- 20% |
+ 20% |
|
| After 1 |
80% |
120% |
|
| Change 2 |
|
- 60% |
+ 60% |
| After 2 |
|
60% |
|
Percentage of sweets after David received from Ivan
= 100% + 20%
= 120%
Percentage of David's sweets that Tammy had after receiving from David
= 50% x 120%
=
50100 x 120%
= 60%
Percentage of sweets that David had left after giving to Tammy
= 120% - 60%
= 60%
100% = 20
Number of sweets that David had left
= 60% x 20
=
60100 x 20
= 12
Answer(s): 12
