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