Sabrina and Opal have 308 cards altogether. Opal has thrice as many cards as Sabrina. How many cards must Opal give to Sabrina so that they have the same number of cards?
| |
Sabrina |
Opal |
Total |
| Before |
1 u |
3 u |
308 |
| Change |
+ ? |
- ? |
|
| After |
154 |
154 |
308 |
Total number of cards that Sabrina and Opal have
= 1 u + 3 u
= 4 u
4 u = 308
1 u = 308 ÷ 4 = 77
Number of cards that Sabrina and Opal each has in the end
= 308 ÷ 2
= 154
Number of cards that Opal must give to Sabrina
= 154 - 77
= 77
Answer(s): 77
