Reggie and Seth had an equal number of books. Reggie donated
15 of her books and Seth donated
13 of his books. Seth donated 10 more books than Reggie. How many books did Seth have at first?
| |
Reggie |
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 Reggie and Seth each had at first is the same. Make the number of books that Reggie and Seth had at first the same. LCM of 5 and 3 is 15.
Number of books that Seth donated more than Reggie
= 5 u - 3 u
= 2 u
2 u = 10
1 u = 10 ÷ 2 = 5
Number of books that Seth had
= 15 u
= 15 x 5
= 75
Answer(s): 75
