Yoko bought some Social Science books at $20 each. She also bought an equal number of English books at a different price. The average price of one Social Science and one English book was $12. Yoko paid $176 more for the Social Science books than the English books.
- What was the cost of one English book?
- How many Social Science books did Yoko buy?
|
Social Science |
English |
More |
Number |
1 u |
1 u |
|
Value |
$20 |
$4 |
|
Total value |
20 u |
4 u |
$176 |
(a)
Price of one English book
= 2 x 12 - 20
= 24 - 20
= $4
Amount that Yoko paid more for Social Science books than English books
= 20 u - 4 u
= 16 u
16 u = 176
1 u = 176 ÷ 16 = 11
Number of Social Science books that Yoko bought
= 1 u
= 11
Answer(s): (a) $4; (b) 11