Fanny and Zara had an equal number of buttons at first. Fanny used
13 of her buttons and Zara used
16 of her buttons. They used 18 buttons altogether. How many buttons did Zara have in the end?
| |
Fanny |
Zara |
| Before |
3x2 =
6 u |
6x1 =
6 u |
| Change |
- 1x2 =
- 2 u |
- 1x1 =
- 1 u |
| After |
2x2 =
4 u |
5x1 =
5 u |
The number of buttons that Fanny and Zara each had at first is the same. Make the number of buttons that Fanny and Zara each had at first the same. LCM of 3 and 6 is 6.
Number of buttons that Fanny and Zara used
= 2 u + 1 u
= 3 u
3 u = 18
1 u = 18 ÷ 3 = 6
Number of buttons that Zara had in the end
= 5 u
= 5 x 6
= 30
Answer(s): 30
