It’s the first box goes to the 3rd missing thing and the second goes to the 4th and the 3rd goes to the 1st and 4th goes to the 2nd I think if that makes sense
We always start from right side in order of operation in any equation
we can set up equation as
step-1:
x divided by three
we can write as

step-2:
six more than x divided by three
so, we get

step-3:
y is six more than x divided by three
so, we get

and this is in y=mx+b form
so, we have
...............Answer
4/5 is the quotient or the answer
1/50 = x/1500
Cross multiply:
50x = 1500(1)
50x = 1500
x = 1500/50
x = 30 people
Therefore, the answer is b as 30 people will receive free admissions.