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Math problem! ! ! ! ! ! ! ! ! !
The first little question

( 1.6 * 15+2.0 * 15+ 1.8 * 10)/( 15+ 10) = 65438.

1.8 * 2000 = 3600kg

3600*7.5=27000 yuan

Answer; Each fish 1.8 kg, and the total weight of all fish is 3600 kg, so you can get 2700 yuan.

the second question

Let the big fish have x kilograms, then the small fish have (3600-X).

Get it according to the meaning of the question.

10x+6(3600-x)= 27000 x = 1350kg。

A big fish has 1350kg.

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