Billy and Zeph had a total of 84 cards. Zeph had half as many cards as Billy. How many cards must Billy give to Zeph so they have an equal number of cards?
| |
Billy |
Zeph |
Total |
| Before |
2 u |
1 u |
84 |
| Change |
- ? |
+ ? |
|
| After |
1 |
1 |
|
Total number of cards at first = 3 u
1 u = 84 ÷ 3 = 28
Billy and Zeph have an equal number of cards in the end.
Number of cards that Zeph has in the end
= 84 ÷ 2
= 42
Number of cards that Billy must give to Zeph
= 42 - 28
= 14
Answer(s): 14
