Question

A dictionary cost $24. The total cost of the dictionary and 4 identical diaries is the same as 7 diaries. How much does 1 diary cost?

Answer 1

Let the price of diaries be x, and set up an equation:

4x + 24 = 7x

isolate x by subtracting the 4x over:

24 = 3x

Divide by 3:

x = 8

The price is $8 per diary