Albert and Fabian had an equal number of books. Albert donated
19 of her books and Fabian donated
17 of his books. Fabian donated 20 more books than Albert. How many books did Fabian have at first?
| |
Albert |
Fabian |
Before
|
9x7 =
63 u |
7x9 =
63 u |
Change
|
- 1x7 =
- 7 u |
- 1x9 =
- 9 u |
After
|
8x7 =
56 u |
6x9 =
54 u |
The number of books that Albert and Fabian each had at first is the same. Make the number of books that Albert and Fabian had at first the same. LCM of 9 and 7 is 63.
Number of books that Fabian donated more than Albert
= 9 u - 7 u
= 2 u
2 u = 20
1 u = 20 ÷ 2 = 10
Number of books that Fabian had
= 63 u
= 63 x 10
= 630
Answer(s): 630
