Tammy bought some Social Science books at $10 each. She also bought an equal number of Literature books at a different price. The average price of one Social Science and one Literature book was $7. Tammy paid $18 less for the Literature books than the Social Science books.
- What was the cost of one Literature book?
- How many Social Science books did Tammy buy?
|
Social Science |
Literature |
Less |
Number |
1 u |
1 u |
|
Value |
$10 |
$4 |
|
Total value |
10 u |
4 u |
$18 |
(a)
Price of one Literature book
= 2 x 7 - 10
= 14 - 10
= $4
Amount that Tammy paid less for Literature books than Social Science books
= 10 u - 4 u
= 6 u
6 u = 18
1 u = 18 ÷ 6 = 3
Number of Social Science books that Tammy bought
= 1 u
= 3
Answer(s): (a) $4; (b) 3