Joelle bought some Japanese books at $7 each. She also bought an equal number of Maths books at a different price. The average price of one Japanese and one Maths book was $5. Joelle paid $48 less for the Maths books than the Japanese books.
- What was the cost of one Maths book?
- How many Japanese books did Joelle buy?
|
Japanese |
Maths |
Less |
Number |
1 u |
1 u |
|
Value |
$7 |
$3 |
|
Total value |
7 u |
3 u |
$48 |
(a)
Price of one Maths book
= 2 x 5 - 7
= 10 - 7
= $3
Amount that Joelle paid less for Maths books than Japanese books
= 7 u - 3 u
= 4 u
4 u = 48
1 u = 48 ÷ 4 = 12
Number of Japanese books that Joelle bought
= 1 u
= 12
Answer(s): (a) $3; (b) 12