Andy and Julian had an equal number of books. Andy donated
17 of her books and Julian donated
13 of his books. Julian donated 8 more books than Andy. How many books did Julian have at first?
| |
Andy |
Julian |
Before
|
7x3 =
21 u |
3x7 =
21 u |
Change
|
- 1x3 =
- 3 u |
- 1x7 =
- 7 u |
After
|
6x3 =
18 u |
2x7 =
14 u |
The number of books that Andy and Julian each had at first is the same. Make the number of books that Andy and Julian had at first the same. LCM of 7 and 3 is 21.
Number of books that Julian donated more than Andy
= 7 u - 3 u
= 4 u
4 u = 8
1 u = 8 ÷ 4 = 2
Number of books that Julian had
= 21 u
= 21 x 2
= 42
Answer(s): 42
