Riordan and Julian had an equal number of books. Riordan donated
18 of her books and Julian donated
15 of his books. Julian donated 12 more books than Riordan. How many books did Julian have at first?
| |
Riordan |
Julian |
Before
|
8x5 =
40 u |
5x8 =
40 u |
Change
|
- 1x5 =
- 5 u |
- 1x8 =
- 8 u |
After
|
7x5 =
35 u |
4x8 =
32 u |
The number of books that Riordan and Julian each had at first is the same. Make the number of books that Riordan and Julian had at first the same. LCM of 8 and 5 is 40.
Number of books that Julian donated more than Riordan
= 8 u - 5 u
= 3 u
3 u = 12
1 u = 12 ÷ 3 = 4
Number of books that Julian had
= 40 u
= 40 x 4
= 160
Answer(s): 160
