Raeann bought some Social Science books at $13 each. She also bought an equal number of Biology books at a different price. The average price of one Social Science and one Biology book was $8. Raeann paid $60 less for the Biology books than the Social Science books.
- What was the cost of one Biology book?
- How many Social Science books did Raeann buy?
|
Social Science |
Biology |
Less |
Number |
1 u |
1 u |
|
Value |
$13 |
$3 |
|
Total value |
13 u |
3 u |
$60 |
(a)
Price of one Biology book
= 2 x 8 - 13
= 16 - 13
= $3
Amount that Raeann paid less for Biology books than Social Science books
= 13 u - 3 u
= 10 u
10 u = 60
1 u = 60 ÷ 10 = 6
Number of Social Science books that Raeann bought
= 1 u
= 6
Answer(s): (a) $3; (b) 6