Jack and Vaidev had an equal number of books. Jack donated
17 of her books and Vaidev donated
15 of his books. Vaidev donated 10 more books than Jack. How many books did Vaidev have at first?
| |
Jack |
Vaidev |
Before
|
7x5 =
35 u |
5x7 =
35 u |
Change
|
- 1x5 =
- 5 u |
- 1x7 =
- 7 u |
After
|
6x5 =
30 u |
4x7 =
28 u |
The number of books that Jack and Vaidev each had at first is the same. Make the number of books that Jack and Vaidev had at first the same. LCM of 7 and 5 is 35.
Number of books that Vaidev donated more than Jack
= 7 u - 5 u
= 2 u
2 u = 10
1 u = 10 ÷ 2 = 5
Number of books that Vaidev had
= 35 u
= 35 x 5
= 175
Answer(s): 175
