Zara, Lynn and Xuan have 648 cards. Zara has
45 as many cards as Lynn. Xuan's cards is
15 of the total number of Zara's and Lynn's cards. How many cards must Lynn give to Xuan so that both Zara and Xuan will have the same number of cards?
Zara |
Lynn |
Xuan |
Total |
5x9 = 45 u |
1x9 = 9 u |
|
4x5 = 20 u |
5x5 = 25 u |
|
|
20 u |
25 u |
9 u |
648 |
Total number of cards
= 20 u + 25 u + 9 u
= 54 u
54 u = 648
1 u = 648 ÷ 54 = 12
Zara |
Lynn |
Xuan |
Total |
20 u |
25 u |
9 u |
648 |
|
- 11 u |
+ 11 u |
|
20 u |
14 u |
20 u |
648 |
Number of cards that Lynn must give to Xuan
= 20 u - 9 u
= 11 u
= 11 x 12
= 132
Answer(s): 132