Billy and Riordan shared some buttons. Billy took
511 of the buttons. After Billy lost 10 buttons, Riordan had twice as many buttons as Billy. How many buttons did Riordan have in the end?
|
Billy |
Riordan |
Before |
5 u |
6 u |
Change |
- 10 |
|
After |
1x3 = 3 u |
2x3 = 6 u |
The number of buttons that Riordan had remains the same. Make the number of buttons that Riordan had the same. LCM of 6 and 2 is 6.
Number of buttons that Billy lost
= 5 u - 3 u
= 2 u
2 u = 10
1 u = 10 ÷ 2 = 5
Number of buttons that Riordan had in the end
= 6 u
= 6 x 5
= 30
Answer(s): 30