Cathy and Natalie had an equal number of buttons at first. Cathy used
15 of her buttons and Natalie used
16 of her buttons. They used 77 buttons altogether. How many buttons did Natalie have in the end?
|
Cathy |
Natalie |
Before |
5x6 = 30 u |
6x5 = 30 u |
Change |
- 1x6 = - 6 u |
- 1x5 = - 5 u |
After |
4x6 = 24 u |
5x5 = 25 u |
The number of buttons that Cathy and Natalie each had at first is the same. Make the number of buttons that Cathy and Natalie each had at first the same. LCM of 5 and 6 is 30.
Number of buttons that Cathy and Natalie used
= 6 u + 5 u
= 11 u
11 u = 77
1 u = 77 ÷ 11 = 7
Number of buttons that Natalie had in the end
= 25 u
= 25 x 7
= 175
Answer(s): 175