Caden and Andy had an equal number of books. Caden donated
17 of her books and Andy donated
15 of his books. Andy donated 18 more books than Caden. How many books did Andy have at first?
| |
Caden |
Andy |
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 Caden and Andy each had at first is the same. Make the number of books that Caden and Andy had at first the same. LCM of 7 and 5 is 35.
Number of books that Andy donated more than Caden
= 7 u - 5 u
= 2 u
2 u = 18
1 u = 18 ÷ 2 = 9
Number of books that Andy had
= 35 u
= 35 x 9
= 315
Answer(s): 315
