Jaslyn had 70 more buttons than Zoe. After Zoe gave away
15 of her buttons, Jaslyn had thrice as many buttons as Zoe. How many buttons did Zoe have at first?
| |
Jaslyn |
Zoe |
Comparing Jaslyn and
Zoe at first |
70 more |
|
| Before |
12 u |
5 u |
| Change |
|
- 1 u |
| After |
12 u |
4 u |
Comparing Jaslyn and
Zoe in the end |
3x4 =
12 u |
1x4 =
4 u |
Number of buttons that Zoe had in the end is repeated. Make the number of buttons that Zoe had in the end the same. LCM of 1 and 4 is 4.
Number of buttons that Jaslyn had at first = 12 u
Number of buttons that Jaslyn had more than Zoe at first
= 12 u - 5 u
= 7 u
7 u = 70
1 u = 70 ÷ 7 = 10
Number of buttons that Zoe had at first
= 5 u
= 5 x 10
= 50
Answer(s): 50
