Ahmad and Owen had an equal number of books. Ahmad donated
19 of her books and Owen donated
15 of his books. Owen donated 20 more books than Ahmad. How many books did Owen have at first?
| |
Ahmad |
Owen |
Before
|
9x5 =
45 u |
5x9 =
45 u |
Change
|
- 1x5 =
- 5 u |
- 1x9 =
- 9 u |
After
|
8x5 =
40 u |
4x9 =
36 u |
The number of books that Ahmad and Owen each had at first is the same. Make the number of books that Ahmad and Owen had at first the same. LCM of 9 and 5 is 45.
Number of books that Owen donated more than Ahmad
= 9 u - 5 u
= 4 u
4 u = 20
1 u = 20 ÷ 4 = 5
Number of books that Owen had
= 45 u
= 45 x 5
= 225
Answer(s): 225
