Mathematics
Grade6
Easy

Question


If the cost of books is $30, then the number of books is ________.

  1. 10
  2. 12
  3. 20
  4. 40

Hint:

The defining property of a linear function graph is that it has a constant rate of change.

The correct answer is: 10


    Here number of books : cost of books = 2:6 = 1:3
    This means, that 3$ is the cost of 1book.
    cross times10 = 30$ is the cost of 1 cross times10 = 10books
    Thus ,10 books cost 30$.

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