Billy and Tom had 20 sweets each. Billy gave 25% of his sweets to Tom. After receiving the sweets from Billy, Tom gave 40% of his total sweets to Betty. How many sweets had Tom left?
| |
Billy |
Tom |
Betty |
| Before |
100% |
100% |
|
| Change 1 |
- 25% |
+ 25% |
|
| After 1 |
75% |
125% |
|
| Change 2 |
|
- 50% |
+ 50% |
| After 2 |
|
75% |
|
Percentage of sweets after Tom received from Billy
= 100% + 25%
= 125%
Percentage of Tom's sweets that Betty had after receiving from Tom
= 40% x 125%
=
40100 x 125%
= 50%
Percentage of sweets that Tom had left after giving to Betty
= 125% - 50%
= 75%
100% = 20
Number of sweets that Tom had left
= 75% x 20
=
75100 x 20
= 15
Answer(s): 15
