Multiple choice

Ratio of tables to chairs in a classroom is 1: 3. If the total number of tables and chairs in the classroom is 40, how many are chairs?

  1. 10

  2. 20

  3. 30

  4. 40
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C Correct answer
Explanation

The ratio of tables to chairs is 1:3, meaning for every 4 units total, 3 are chairs. Total units = 40. One unit = 40 / 4 = 10. Chairs = 3 * 10 = 30.

AI explanation

Let the number of tables be 1x and the number of chairs be 3x based on their given ratio. Their sum is 1x plus 3x, which equals 4x, and since the total number of tables and chairs is 40, we write the equation 4x equals 40. Solving for x gives a value of 10, meaning the number of chairs is 3 multiplied by 10, which equals 30.

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