Riordan and Elijah had an equal number of books. Riordan donated
17 of her books and Elijah donated
13 of his books. Elijah donated 32 more books than Riordan. How many books did Elijah have at first?
| |
Riordan |
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 Riordan and Elijah each had at first is the same. Make the number of books that Riordan and Elijah had at first the same. LCM of 7 and 3 is 21.
Number of books that Elijah donated more than Riordan
= 7 u - 3 u
= 4 u
4 u = 32
1 u = 32 ÷ 4 = 8
Number of books that Elijah had
= 21 u
= 21 x 8
= 168
Answer(s): 168
