Vincent has 10% as many buttons as Paul. If Vincent gives away 50% of the buttons and Paul gives away 80% of his buttons, they will have 60 buttons altogether. How many buttons do the two of them have?
|
Vincent |
Paul |
Total |
Comparing Vincent and Paul at first |
1x2 = 2 u |
10x2 = 20 u |
|
Before |
2x1 = 2 u |
5x4 = 20 u |
|
Change |
- 1x1 = - 1 u |
- 4x4 = - 16 u |
|
After |
1x1 = 1 u |
1x4 = 4 u |
60 |
10% =
10100 =
110 50% =
50100 =
12 80% =
80100 =
45 The number of buttons that Vincent has at first is repeated. Make the number of buttons that Vincent has the same. LCM of 1 and 2 is 2 u.
The number of buttons that Paul has at first is repeated. Make the number of buttons that Paul has the same. LCM of 10 and 5 is 20 u.
Number of buttons in the end
= 1 u + 4 u
= 5 u
5 u = 60
1 u = 60 ÷ 5 = 12
Total number of buttons that the two of them have
= 2 u + 20 u
= 22 u
= 22 x 12
= 264
Answer(s): 264