8/11--------> 16
to find the total number of fish, divide 16 by 8 and multiply it by 11,
16÷8=2
2×11=22
total number of fish= 22
check,
22÷11×8=16
if you want to find the number of fish without the red stripes,
8/11--------> 16
11/11------->22
3/11--------->?
you can either subtract 16 by 22=6
or
22÷11×3=6
hope this helps......