Fabian and Sam had an equal number of books. Fabian donated
19 of her books and Sam donated
15 of his books. Sam donated 12 more books than Fabian. How many books did Sam have at first?
| |
Fabian |
Sam |
Before
|
9x5 =
45 u |
5x9 =
45 u |
Change
|
- 1x5 =
- 5 u |
- 1x9 =
- 9 u |
After
|
8x5 =
40 u |
4x9 =
36 u |
The number of books that Fabian and Sam each had at first is the same. Make the number of books that Fabian and Sam had at first the same. LCM of 9 and 5 is 45.
Number of books that Sam donated more than Fabian
= 9 u - 5 u
= 4 u
4 u = 12
1 u = 12 ÷ 4 = 3
Number of books that Sam had
= 45 u
= 45 x 3
= 135
Answer(s): 135
