Mary has 2 times as many buttons as Shiyun. Shiyun has
67 as many buttons as Kylie. If the three of them have a total of 150 buttons, how many buttons does Kylie have?
Mary |
Shiyun |
Kylie |
2x6 |
1x6 |
|
|
6x1 |
7x1 |
12 u |
6 u |
7 u |
The number of buttons that Shiyun has is repeated. Make the number of buttons that Shiyun has the same. LCM of 1 and 6 is 6.
Total number of buttons that the three of them have
= 12 u + 6 u + 7 u
= 25 u
25 u = 150
1 u = 150 ÷ 25 = 6
Number of buttons that Kylie has
= 7 u
= 7 x 6
= 42
Answer(s): 42