Question 1603
First of all, you need to divide 26.5 by 30, to work out the percentage correct.  You then need to multiply the answer by 100, to get the correct answer.
{{{(26.5/30)*100}}}
The answer is 88.33, out of 100.

Continue in this way for the next two:
{{{(23/35)*100}}}
and
{{{(23/40)*100}}}.

The final answers are 88.33 out of 100, 65.71 out of 100, and 57.5 out of 100, all rounded to 2 decimal places.