Ian and Billy have a total of 70 cards. If Ian gives Billy 21 cards, Billy will have 4 times as many cards as him. Find
(a) Ian's cards
(b) Billy's cards
|
Ian |
Billy |
Total |
Before |
1 u + 21 |
4 u - 21 |
70 |
Change |
- 21 |
+ 21 |
|
After |
1 u |
4 u |
5 u |
(a)
Total number of cards
= 1 u + 4 u
= 5 u
5 u = 70
1 u = 70 ÷ 5 = 14
Number of cards that Ian has
= 1 u + 21
= 14 + 21
= 35
(b)
Number of cards that Billy has
= 70 - 35
= 35
Answer(s): (a) 35; (b) 35