Oliver and Liam had an equal number of books. Oliver donated
19 of her books and Liam donated
13 of his books. Liam donated 10 more books than Oliver. How many books did Liam have at first?
| |
Oliver |
Liam |
Before
|
9x1 =
9 u |
3x3 =
9 u |
Change
|
- 1x1 =
- 1 u |
- 1x3 =
- 3 u |
After
|
8x1 =
8 u |
2x3 =
6 u |
The number of books that Oliver and Liam each had at first is the same. Make the number of books that Oliver and Liam had at first the same. LCM of 9 and 3 is 9.
Number of books that Liam donated more than Oliver
= 3 u - 1 u
= 2 u
2 u = 10
1 u = 10 ÷ 2 = 5
Number of books that Liam had
= 9 u
= 9 x 5
= 45
Answer(s): 45
