Tiffany bought some Japanese books at $13 each. She also bought an equal number of Social Science books at a different price. The average price of one Japanese and one Social Science book was $8. Tiffany paid $100 more for the Japanese books than the Social Science books.
- What was the cost of one Social Science book?
- How many Japanese books did Tiffany buy?
|
Japanese |
Social Science |
More |
Number |
1 u |
1 u |
|
Value |
$13 |
$3 |
|
Total value |
13 u |
3 u |
$100 |
(a)
Price of one Social Science book
= 2 x 8 - 13
= 16 - 13
= $3
Amount that Tiffany paid more for Japanese books than Social Science books
= 13 u - 3 u
= 10 u
10 u = 100
1 u = 100 ÷ 10 = 10
Number of Japanese books that Tiffany bought
= 1 u
= 10
Answer(s): (a) $3; (b) 10