Esther bought some Japanese books at $7 each. She also bought an equal number of Biology books at a different price. The average price of one Japanese and one Biology book was $5. Esther paid $44 less for the Biology books than the Japanese books.
- What was the cost of one Biology book?
- How many Japanese books did Esther buy?
|
Japanese |
Biology |
Less |
Number |
1 u |
1 u |
|
Value |
$7 |
$3 |
|
Total value |
7 u |
3 u |
$44 |
(a)
Price of one Biology book
= 2 x 5 - 7
= 10 - 7
= $3
Amount that Esther paid less for Biology books than Japanese books
= 7 u - 3 u
= 4 u
4 u = 44
1 u = 44 ÷ 4 = 11
Number of Japanese books that Esther bought
= 1 u
= 11
Answer(s): (a) $3; (b) 11