Tim and Bobby had an equal number of books. Tim donated
17 of her books and Bobby donated
14 of his books. Bobby donated 24 more books than Tim. How many books did Bobby have at first?
| |
Tim |
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 Tim and Bobby each had at first is the same. Make the number of books that Tim and Bobby had at first the same. LCM of 7 and 4 is 28.
Number of books that Bobby donated more than Tim
= 7 u - 4 u
= 3 u
3 u = 24
1 u = 24 ÷ 3 = 8
Number of books that Bobby had
= 28 u
= 28 x 8
= 224
Answer(s): 224
