Michael and Bobby had an equal number of books. Michael donated
17 of her books and Bobby donated
14 of his books. Bobby donated 27 more books than Michael. How many books did Bobby have at first?
| |
Michael |
Bobby |
Before
|
7x4 =
28 u |
4x7 =
28 u |
Change
|
- 1x4 =
- 4 u |
- 1x7 =
- 7 u |
After
|
6x4 =
24 u |
3x7 =
21 u |
The number of books that Michael and Bobby each had at first is the same. Make the number of books that Michael and Bobby had at first the same. LCM of 7 and 4 is 28.
Number of books that Bobby donated more than Michael
= 7 u - 4 u
= 3 u
3 u = 27
1 u = 27 ÷ 3 = 9
Number of books that Bobby had
= 28 u
= 28 x 9
= 252
Answer(s): 252
