Ian and Bryan had an equal number of books. Ian donated
17 of her books and Bryan donated
13 of his books. Bryan donated 28 more books than Ian. How many books did Bryan have at first?
| |
Ian |
Bryan |
Before
|
7x3 =
21 u |
3x7 =
21 u |
Change
|
- 1x3 =
- 3 u |
- 1x7 =
- 7 u |
After
|
6x3 =
18 u |
2x7 =
14 u |
The number of books that Ian and Bryan each had at first is the same. Make the number of books that Ian and Bryan had at first the same. LCM of 7 and 3 is 21.
Number of books that Bryan donated more than Ian
= 7 u - 3 u
= 4 u
4 u = 28
1 u = 28 ÷ 4 = 7
Number of books that Bryan had
= 21 u
= 21 x 7
= 147
Answer(s): 147
