Harry and Elijah had an equal number of books. Harry donated
17 of her books and Elijah donated
13 of his books. Elijah donated 28 more books than Harry. How many books did Elijah have at first?
| |
Harry |
Elijah |
Before
|
7x3 =
21 u |
3x7 =
21 u |
Change
|
- 1x3 =
- 3 u |
- 1x7 =
- 7 u |
After
|
6x3 =
18 u |
2x7 =
14 u |
The number of books that Harry and Elijah each had at first is the same. Make the number of books that Harry and Elijah had at first the same. LCM of 7 and 3 is 21.
Number of books that Elijah donated more than Harry
= 7 u - 3 u
= 4 u
4 u = 28
1 u = 28 ÷ 4 = 7
Number of books that Elijah had
= 21 u
= 21 x 7
= 147
Answer(s): 147
