Jade bought some Physics books at $7 each. She also bought an equal number of French books at a different price. The average price of one Physics and one French book was $5. Jade paid $40 less for the French books than the Physics books.
- What was the cost of one French book?
- How many Physics books did Jade buy?
|
Physics |
French |
Less |
Number |
1 u |
1 u |
|
Value |
$7 |
$3 |
|
Total value |
7 u |
3 u |
$40 |
(a)
Price of one French book
= 2 x 5 - 7
= 10 - 7
= $3
Amount that Jade paid less for French books than Physics books
= 7 u - 3 u
= 4 u
4 u = 40
1 u = 40 ÷ 4 = 10
Number of Physics books that Jade bought
= 1 u
= 10
Answer(s): (a) $3; (b) 10