A teacher bought 40 chocolate bars 60 candies and 20 wafers to divide among the students the amount in how many students does the teacher have and how many pieces of each type of candy will each student get

1. Determine the GCD of the numbers 40, 60, and 20.

\text{GCD}(40, 60, 20) = 20

2. Divide each of the quantities by the GCD to find how many pieces each student will get.

For chocolate bars:

\frac{40}{20} = 2 \text{ chocolate bars per student}

For candies:

\frac{60}{20} = 3 \text{ candies per student}

For wafers:

\frac{20}{20} = 1 \text{ wafer per student}

Thus, each student will get 2 chocolate bars, 3 candies, and 1 wafer.

Answer: 20 students can each get 2 chocolate bars, 3 candies, and 1 wafer.