assuming 13 and 23 means 1/3 and 2/3
then 1.5/3 is in middle
multiply both by 2 so
1.5/3 x 2/2 = 3/6 = 1/2
by dividing both by 3
one half
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23
13/5 or 23/5
They are: 3 13 23 43 53 73 and 83 which as a fraction is 7/25 because there are 25 primes between one and a hundred
(13 + 23)/2 = 18
13/20 = 23/20