Ryan and Xavier had an equal number of books. Ryan donated
19 of her books and Xavier donated
13 of his books. Xavier donated 4 more books than Ryan. How many books did Xavier have at first?
| |
Ryan |
Xavier |
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 Ryan and Xavier each had at first is the same. Make the number of books that Ryan and Xavier had at first the same. LCM of 9 and 3 is 9.
Number of books that Xavier donated more than Ryan
= 3 u - 1 u
= 2 u
2 u = 4
1 u = 4 ÷ 2 = 2
Number of books that Xavier had
= 9 u
= 9 x 2
= 18
Answer(s): 18
