Tommy and Seth had an equal number of books. Tommy donated
15 of her books and Seth donated
13 of his books. Seth donated 8 more books than Tommy. How many books did Seth have at first?
| |
Tommy |
Seth |
Before
|
5x3 =
15 u |
3x5 =
15 u |
Change
|
- 1x3 =
- 3 u |
- 1x5 =
- 5 u |
After
|
4x3 =
12 u |
2x5 =
10 u |
The number of books that Tommy and Seth each had at first is the same. Make the number of books that Tommy and Seth had at first the same. LCM of 5 and 3 is 15.
Number of books that Seth donated more than Tommy
= 5 u - 3 u
= 2 u
2 u = 8
1 u = 8 ÷ 2 = 4
Number of books that Seth had
= 15 u
= 15 x 4
= 60
Answer(s): 60
