Oscar and Bryan had an equal number of books. Oscar donated
19 of her books and Bryan donated
13 of his books. Bryan donated 16 more books than Oscar. How many books did Bryan have at first?
| |
Oscar |
Bryan |
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 Oscar and Bryan each had at first is the same. Make the number of books that Oscar and Bryan had at first the same. LCM of 9 and 3 is 9.
Number of books that Bryan donated more than Oscar
= 3 u - 1 u
= 2 u
2 u = 16
1 u = 16 ÷ 2 = 8
Number of books that Bryan had
= 9 u
= 9 x 8
= 72
Answer(s): 72
