exam Maths Puzzle Numerical Ability

I hopr this is the right place for this question. Thanks for any and all help. I need assistance with this question please.
Find the five-number summary of the following set of n

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This question is really hard and I need a lot of help!


Researchers marked and released 36 pike in a pond. Later they counted 20 pike, 12 of which were marked. Estimate the pike population. See I got the answer 60 is that right or am I wrong?
3/5x-2/9y=-13
x=15
solve for y
my work...
3/5(15)-2/9y=-13
45/5-2/9y=-13
9-2/9y=-13
9+13=2/9y
(9/2)22=2/9y(9/2)
99=y