Rachel and Nora had an equal number of cards at first. Rachel used
15 of her cards and Nora used
16 of her cards. They used 22 cards altogether. How many cards did Nora have in the end?
|
Rachel |
Nora |
Before |
5x6 = 30 u |
6x5 = 30 u |
Change |
- 1x6 = - 6 u |
- 1x5 = - 5 u |
After |
4x6 = 24 u |
5x5 = 25 u |
The number of cards that Rachel and Nora each had at first is the same. Make the number of cards that Rachel and Nora each had at first the same. LCM of 5 and 6 is 30.
Number of cards that Rachel and Nora used
= 6 u + 5 u
= 11 u
11 u = 22
1 u = 22 ÷ 11 = 2
Number of cards that Nora had in the end
= 25 u
= 25 x 2
= 50
Answer(s): 50