Erika and Abi had an equal number of lollipops. After Erika bought another 20 lollipops and Abi bought another 4 lollipops, Erika had thrice as many lollipops as Abi. Find the number of lollipops that each of them had at first.
| |
Erika |
Abi |
| Before |
3 u - 20 |
1 u - 4 |
| Change |
+ 20 |
+ 4 |
| After |
3 u |
1 u |
The number of lollipops that Erika and Abi had at first is the same.
3 u - 20 = 1 u - 4
3 u - 1 u = 20 - 4
2 u = 16
1 u = 16 ÷ 2 = 8
Number of lollipops that each had at first
= 8 - 4
= 4
Answer(s): 4
