Elijah and Seth had an equal number of books. Elijah donated
18 of her books and Seth donated
13 of his books. Seth donated 25 more books than Elijah. How many books did Seth have at first?
| |
Elijah |
Seth |
Before
|
8x3 =
24 u |
3x8 =
24 u |
Change
|
- 1x3 =
- 3 u |
- 1x8 =
- 8 u |
After
|
7x3 =
21 u |
2x8 =
16 u |
The number of books that Elijah and Seth each had at first is the same. Make the number of books that Elijah and Seth had at first the same. LCM of 8 and 3 is 24.
Number of books that Seth donated more than Elijah
= 8 u - 3 u
= 5 u
5 u = 25
1 u = 25 ÷ 5 = 5
Number of books that Seth had
= 24 u
= 24 x 5
= 120
Answer(s): 120
