Kylie bought some French books at $15 each. She also bought an equal number of Geography books at a different price. The average price of one French and one Geography book was $11. Kylie paid $80 more for the French books than the Geography books.
- What was the cost of one Geography book?
- How many French books did Kylie buy?
|
French |
Geography |
More |
Number |
1 u |
1 u |
|
Value |
$15 |
$7 |
|
Total value |
15 u |
7 u |
$80 |
(a)
Price of one Geography book
= 2 x 11 - 15
= 22 - 15
= $7
Amount that Kylie paid more for French books than Geography books
= 15 u - 7 u
= 8 u
8 u = 80
1 u = 80 ÷ 8 = 10
Number of French books that Kylie bought
= 1 u
= 10
Answer(s): (a) $7; (b) 10