Olivia bought some Malay books at $17 each. She also bought an equal number of Chemistry books at a different price. The average price of one Malay and one Chemistry book was $10. Olivia paid $168 less for the Chemistry books than the Malay books.
- What was the cost of one Chemistry book?
- How many Malay books did Olivia buy?
|
Malay |
Chemistry |
Less |
Number |
1 u |
1 u |
|
Value |
$17 |
$3 |
|
Total value |
17 u |
3 u |
$168 |
(a)
Price of one Chemistry book
= 2 x 10 - 17
= 20 - 17
= $3
Amount that Olivia paid less for Chemistry books than Malay books
= 17 u - 3 u
= 14 u
14 u = 168
1 u = 168 ÷ 14 = 12
Number of Malay books that Olivia bought
= 1 u
= 12
Answer(s): (a) $3; (b) 12