Question

I really don’t understand this

Answer 1

Well, in percentages, Other = 100% - 40% - 37,5% = 22,5%

In numbers, Other = 18.

If 18___22.5%=0.225

Then x___100%=1

So x = (18*1)/0.225 = 18/0.225 = 80, and 80 is the first answer, the number of students participated.

For second question, which is how many chose football, we have:

x_____37.5%=0.375

18____22.5%=0.225

x = (18* 0.375) / 0.225 = 30

The second answer is 30.