Sabrina bought some Japanese books at $12 each. She also bought an equal number of Chemistry books at a different price. The average price of one Japanese and one Chemistry book was $9. Sabrina paid $66 less for the Chemistry books than the Japanese books.
- What was the cost of one Chemistry book?
- How many Japanese books did Sabrina buy?
|
Japanese |
Chemistry |
Less |
Number |
1 u |
1 u |
|
Value |
$12 |
$6 |
|
Total value |
12 u |
6 u |
$66 |
(a)
Price of one Chemistry book
= 2 x 9 - 12
= 18 - 12
= $6
Amount that Sabrina paid less for Chemistry books than Japanese books
= 12 u - 6 u
= 6 u
6 u = 66
1 u = 66 ÷ 6 = 11
Number of Japanese books that Sabrina bought
= 1 u
= 11
Answer(s): (a) $6; (b) 11