Ivan and Xavier had an equal number of books. Ivan donated
17 of her books and Xavier donated
15 of his books. Xavier donated 16 more books than Ivan. How many books did Xavier have at first?
| |
Ivan |
Xavier |
Before
|
7x5 =
35 u |
5x7 =
35 u |
Change
|
- 1x5 =
- 5 u |
- 1x7 =
- 7 u |
After
|
6x5 =
30 u |
4x7 =
28 u |
The number of books that Ivan and Xavier each had at first is the same. Make the number of books that Ivan and Xavier had at first the same. LCM of 7 and 5 is 35.
Number of books that Xavier donated more than Ivan
= 7 u - 5 u
= 2 u
2 u = 16
1 u = 16 ÷ 2 = 8
Number of books that Xavier had
= 35 u
= 35 x 8
= 280
Answer(s): 280
