Question

how many students took the survey?

Explanation:

Step1: Sum all the numbers in the Venn diagram

$$6 + 7+2 + 13+8 + 10+4+3$$

Step2: Calculate the sum

$$6+7 = 13; 13+2 = 15; 15+13 = 28; 28+8 = 36; 36+10 = 46; 46+4 = 50; 50+3 = 53$$

Answer:

53