Marion bought some Chemistry books at $14 each. She also bought an equal number of Social Science books at a different price. The average price of one Chemistry and one Social Science book was $10. Marion paid $24 more for the Chemistry books than the Social Science books.
- What was the cost of one Social Science book?
- How many Chemistry books did Marion buy?
|
Chemistry |
Social Science |
More |
Number |
1 u |
1 u |
|
Value |
$14 |
$6 |
|
Total value |
14 u |
6 u |
$24 |
(a)
Price of one Social Science book
= 2 x 10 - 14
= 20 - 14
= $6
Amount that Marion paid more for Chemistry books than Social Science books
= 14 u - 6 u
= 8 u
8 u = 24
1 u = 24 ÷ 8 = 3
Number of Chemistry books that Marion bought
= 1 u
= 3
Answer(s): (a) $6; (b) 3