Lucy bought some English books at $18 each. She also bought an equal number of Geography books at a different price. The average price of one English and one Geography book was $11. Lucy paid $70 more for the English books than the Geography books.
- What was the cost of one Geography book?
- How many English books did Lucy buy?
|
English |
Geography |
More |
Number |
1 u |
1 u |
|
Value |
$18 |
$4 |
|
Total value |
18 u |
4 u |
$70 |
(a)
Price of one Geography book
= 2 x 11 - 18
= 22 - 18
= $4
Amount that Lucy paid more for English books than Geography books
= 18 u - 4 u
= 14 u
14 u = 70
1 u = 70 ÷ 14 = 5
Number of English books that Lucy bought
= 1 u
= 5
Answer(s): (a) $4; (b) 5