Question

The average weight per fish of 4 fish in a basket is 220 grams . if the biggest fish weighing 310 gms jumps back in to the river what is the average weight of the remaining fish.

Answer 1

mean of 4 fish = 220
weight of 4 fish = 220 *4
weight of 4 fish = 880
880 - 310 / 3 = average weight of 4 fish
average weight of the 3 fish = 570 / 3
average weight of 4 fish = 190
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Answer 2

average weight before jumping = 220 = a +b + c + d/4 = a/4 + b/4 + c/4 +d/4
           a/4 + b/4 + c/4 + 310/4 = 220
           a/4 + b/4 + c/4 + 77.5 = 220
           a/4 +b/4 +c/4 =220 - 77.5 = 142.5
       By multiply both sides of equation by 4/3 we get
          a + b + c/3 = 142.5*4/3
          a + b + c/3 = 190
      average of weight after jumping = 190