Question

A biologist collected 1 gallon of pond water and counted 50 paramecium. based on the sampling technique, how many paramecium could be found in the pond if the pond were 20,000 gallons?

Answer 1

1 gallon of pond water = 50 x 1 paramecium

20,000 gallons of pond water = 50 x 20,000 paramecium = 1,000,000 paramecium

Answer 2

There are 1,000,000 paramecium in 20,000 gallons

Step-by-step explanation:

This problem can be solved by a simple direct rule of three because as the number of gallons of water increases, so does the number of paramecium.

We have that each gallon of pond water has 50 paramecium. How many paramecium are there if there are 20,000 gallons. So

1 gallon - 50 paramecium

20,000 gallons = x paramecium

x = 20,000*50 = 1,000,000 paramecium