Ahmad and Fred had an equal number of books. Ahmad donated
17 of her books and Fred donated
13 of his books. Fred donated 24 more books than Ahmad. How many books did Fred have at first?
| |
Ahmad |
Fred |
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 Ahmad and Fred each had at first is the same. Make the number of books that Ahmad and Fred had at first the same. LCM of 7 and 3 is 21.
Number of books that Fred donated more than Ahmad
= 7 u - 3 u
= 4 u
4 u = 24
1 u = 24 ÷ 4 = 6
Number of books that Fred had
= 21 u
= 21 x 6
= 126
Answer(s): 126
