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