Luis and Liam had an equal number of books. Luis donated
19 of her books and Liam donated
14 of his books. Liam donated 15 more books than Luis. How many books did Liam have at first?
| |
Luis |
Liam |
Before
|
9x4 =
36 u |
4x9 =
36 u |
Change
|
- 1x4 =
- 4 u |
- 1x9 =
- 9 u |
After
|
8x4 =
32 u |
3x9 =
27 u |
The number of books that Luis and Liam each had at first is the same. Make the number of books that Luis and Liam had at first the same. LCM of 9 and 4 is 36.
Number of books that Liam donated more than Luis
= 9 u - 4 u
= 5 u
5 u = 15
1 u = 15 ÷ 5 = 3
Number of books that Liam had
= 36 u
= 36 x 3
= 108
Answer(s): 108
