Tiffany bought some Chemistry books at $15 each. She also bought an equal number of English books at a different price. The average price of one Chemistry and one English book was $10. Tiffany paid $60 more for the Chemistry books than the English books.
- What was the cost of one English book?
- How many Chemistry books did Tiffany buy?
|
Chemistry |
English |
More |
Number |
1 u |
1 u |
|
Value |
$15 |
$5 |
|
Total value |
15 u |
5 u |
$60 |
(a)
Price of one English book
= 2 x 10 - 15
= 20 - 15
= $5
Amount that Tiffany paid more for Chemistry books than English books
= 15 u - 5 u
= 10 u
10 u = 60
1 u = 60 ÷ 10 = 6
Number of Chemistry books that Tiffany bought
= 1 u
= 6
Answer(s): (a) $5; (b) 6