Dana bought some Geography books at $18 each. She also bought an equal number of Chinese books at a different price. The average price of one Geography and one Chinese book was $11. Dana paid $98 more for the Geography books than the Chinese books.
- What was the cost of one Chinese book?
- How many Geography books did Dana buy?
|
Geography |
Chinese |
More |
Number |
1 u |
1 u |
|
Value |
$18 |
$4 |
|
Total value |
18 u |
4 u |
$98 |
(a)
Price of one Chinese book
= 2 x 11 - 18
= 22 - 18
= $4
Amount that Dana paid more for Geography books than Chinese books
= 18 u - 4 u
= 14 u
14 u = 98
1 u = 98 ÷ 14 = 7
Number of Geography books that Dana bought
= 1 u
= 7
Answer(s): (a) $4; (b) 7