Xandra bought some French books at $15 each. She also bought an equal number of Chinese books at a different price. The average price of one French and one Chinese book was $10. Xandra paid $20 less for the Chinese books than the French books.
- What was the cost of one Chinese book?
- How many French books did Xandra buy?
|
French |
Chinese |
Less |
Number |
1 u |
1 u |
|
Value |
$15 |
$5 |
|
Total value |
15 u |
5 u |
$20 |
(a)
Price of one Chinese book
= 2 x 10 - 15
= 20 - 15
= $5
Amount that Xandra paid less for Chinese books than French books
= 15 u - 5 u
= 10 u
10 u = 20
1 u = 20 ÷ 10 = 2
Number of French books that Xandra bought
= 1 u
= 2
Answer(s): (a) $5; (b) 2