Perry had
35 the number of buttons that David had at first. After David gave Perry 30 of his buttons, Perry had
45 the number of buttons that David had. How many buttons did David have in the end?
| |
Perry |
David |
Total |
| Before |
3x9 =
27 u |
5x9 =
45 u |
8x9 =
72 u |
| Change |
+ 5 u |
- 5 u |
|
| After |
4x8 =
32 u |
5x8 =
40 u |
9x8 =
72 u |
The total number of buttons that Perry and David had at first and in the end remains unchanged. Make the total number of buttons the same. LCM of 8 and 9 is 72.
Number of buttons that David gave Perry
= 32 u - 27 u
= 5 u
5 u = 30
1 u = 30 ÷ 5 = 6
Number of buttons that David had in the end
= 40 u
= 40 x 6
= 240
Answer(s): 240
