The number of students that play hockey is 7
The proportion is given as:
The total number of students must be a multiple of 2, 4 and 7 less than 30;
The only multiple of 2, 4 and 7 less than 30 is 28.
The number of students that play hockey is the product of 28 and the proportion that plays hockey.
So, we have:
Multiply
Hence, 7 students play hockey
Read more about common multiples at:
brainly.com/question/290451