Daniel and Rael had an equal number of books. Daniel donated
17 of her books and Rael donated
15 of his books. Rael donated 8 more books than Daniel. How many books did Rael have at first?
| |
Daniel |
Rael |
Before
|
7x5 =
35 u |
5x7 =
35 u |
Change
|
- 1x5 =
- 5 u |
- 1x7 =
- 7 u |
After
|
6x5 =
30 u |
4x7 =
28 u |
The number of books that Daniel and Rael each had at first is the same. Make the number of books that Daniel and Rael had at first the same. LCM of 7 and 5 is 35.
Number of books that Rael donated more than Daniel
= 7 u - 5 u
= 2 u
2 u = 8
1 u = 8 ÷ 2 = 4
Number of books that Rael had
= 35 u
= 35 x 4
= 140
Answer(s): 140
