Fabian and Lee had an equal number of books. Fabian donated
17 of her books and Lee donated
15 of his books. Lee donated 20 more books than Fabian. How many books did Lee have at first?
| |
Fabian |
Lee |
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 Fabian and Lee each had at first is the same. Make the number of books that Fabian and Lee had at first the same. LCM of 7 and 5 is 35.
Number of books that Lee donated more than Fabian
= 7 u - 5 u
= 2 u
2 u = 20
1 u = 20 ÷ 2 = 10
Number of books that Lee had
= 35 u
= 35 x 10
= 350
Answer(s): 350
