Nick and Howard had an equal number of books. Nick donated
19 of her books and Howard donated
17 of his books. Howard donated 20 more books than Nick. How many books did Howard have at first?
| |
Nick |
Howard |
Before
|
9x7 =
63 u |
7x9 =
63 u |
Change
|
- 1x7 =
- 7 u |
- 1x9 =
- 9 u |
After
|
8x7 =
56 u |
6x9 =
54 u |
The number of books that Nick and Howard each had at first is the same. Make the number of books that Nick and Howard had at first the same. LCM of 9 and 7 is 63.
Number of books that Howard donated more than Nick
= 9 u - 7 u
= 2 u
2 u = 20
1 u = 20 ÷ 2 = 10
Number of books that Howard had
= 63 u
= 63 x 10
= 630
Answer(s): 630
