Nora and Anna had an equal number of cards at first. Nora used
14 of her cards and Anna used
18 of her cards. They used 12 cards altogether. How many cards did Anna have in the end?
|
Nora |
Anna |
Before |
4x2 = 8 u |
8x1 = 8 u |
Change |
- 1x2 = - 2 u |
- 1x1 = - 1 u |
After |
3x2 = 6 u |
7x1 = 7 u |
The number of cards that Nora and Anna each had at first is the same. Make the number of cards that Nora and Anna each had at first the same. LCM of 4 and 8 is 8.
Number of cards that Nora and Anna used
= 2 u + 1 u
= 3 u
3 u = 12
1 u = 12 ÷ 3 = 4
Number of cards that Anna had in the end
= 7 u
= 7 x 4
= 28
Answer(s): 28