Eva bought some Literature books at $12 each. She also bought an equal number of Social Science books at a different price. The average price of one Literature and one Social Science book was $10. Eva paid $36 more for the Literature books than the Social Science books.
- What was the cost of one Social Science book?
- How many Literature books did Eva buy?
|
Literature |
Social Science |
More |
Number |
1 u |
1 u |
|
Value |
$12 |
$8 |
|
Total value |
12 u |
8 u |
$36 |
(a)
Price of one Social Science book
= 2 x 10 - 12
= 20 - 12
= $8
Amount that Eva paid more for Literature books than Social Science books
= 12 u - 8 u
= 4 u
4 u = 36
1 u = 36 ÷ 4 = 9
Number of Literature books that Eva bought
= 1 u
= 9
Answer(s): (a) $8; (b) 9