Gillian and Fanny had an equal number of buttons at first. Gillian used
15 of her buttons and Fanny used
17 of her buttons. They used 108 buttons altogether. How many buttons did Fanny have in the end?
| |
Gillian |
Fanny |
| Before |
5x7 =
35 u |
7x5 =
35 u |
| Change |
- 1x7 =
- 7 u |
- 1x5 =
- 5 u |
| After |
4x7 =
28 u |
6x5 =
30 u |
The number of buttons that Gillian and Fanny each had at first is the same. Make the number of buttons that Gillian and Fanny each had at first the same. LCM of 5 and 7 is 35.
Number of buttons that Gillian and Fanny used
= 7 u + 5 u
= 12 u
12 u = 108
1 u = 108 ÷ 12 = 9
Number of buttons that Fanny had in the end
= 30 u
= 30 x 9
= 270
Answer(s): 270
