Apond had 60 fish. 27 were carp and the rest were tench. 10 fish were added. the probability that a fish picked at random is a carp is now 1/2 how many tench were added?

2

Explanation:

A pond had 60 fish but 10 were added so now the pond has 70 fish.

The probability of choosing a carp is 1/2 so = 35 are now carp.  

There were 27 carp and now there are 35 carp so 8 carp were added.

10 fish were added and 8 of them were carp so 2 of them were tench.

it would be:

c.parallelogram.

this is answer of 144 cubic meters