At a bookstore, Noah paid $14 for 1 magazine and 3 textbooks. The magazine cost $5 more than the total cost of all the textbooks.
- How much did 1 magazine cost?
- How much did 1 textbook cost?
(a)
Cost of 3 textbooks = 1 u
Cost of 1 magazine = 1 u + 5
Total cost of 3 textbooks and 1 magazine
= 1 u + 1 u + 5
= 2 u + 5
2 u + 5 = 14
2 u = 14 - 5
2 u = 9
1 u = 9 ÷ 2 = 4.50
Cost of 1 magazine
= 1 u + 5
= 4.50 + 5
= $9.50
(b)
Cost of 3 textbooks = $4.50
Cost of 1 textbook
= 4.50 ÷ 3
= $1.50
Answer(s): (a) $9.50; (b) $1.50