Sabrina had 70 more coins than Anna. After Anna gave away
38 of her coins, Sabrina had thrice as many coins as Anna. How many coins did Anna have at first?
| |
Sabrina |
Anna |
Comparing Sabrina and
Anna at first |
70 more |
|
| Before |
15 u |
8 u |
| Change |
|
- 3 u |
| After |
15 u |
5 u |
Comparing Sabrina and
Anna in the end |
3x5 =
15 u |
1x5 =
5 u |
Number of coins that Anna had in the end is repeated. Make the number of coins that Anna had in the end the same. LCM of 1 and 5 is 5.
Number of coins that Sabrina had at first = 15 u
Number of coins that Sabrina had more than Anna at first
= 15 u - 8 u
= 7 u
7 u = 70
1 u = 70 ÷ 7 = 10
Number of coins that Anna had at first
= 8 u
= 8 x 10
= 80
Answer(s): 80
