<PRE><B>Question 298355</B>
Let the number of fish be x ,
        number of plants be (1/5)x  OR x/5
        number of insects be (1/4)x OR x/4
Then,x + x/4 + x/5 = 203
Least Common Multiple (lcm) is 5 * 4 which is 20
x/1 * 20 + x/4 * 5 + x/5 * 4 =203 
20x/20 + 4x/20 + 5x/20 =203
29x/20 =203
29x = 203 * 20=4060(on transporting 20 to the right side,the sign changes)
x = 4060/29=140(on transporting 29 to the right side multiplication changes to divison)
Therefore there are 140 fishes in the pond.</PRE>