Question

If 82 out of 100 cockroaches are immune to a pesticide after repeated use in an area, how many would be expected to be immune in a population of 2.2 million?

Answer 1

Just work out 82% of 2.2 million , the answer would be around : 1804000

Answer 2

Hi!

The answer is: 1.804.000 cockroaches are immune.

Explanation:

To solve this problem, you can use the rule of three.

100 ----> 2.200.000 cockroaches // If 100% is 2.200.000 cockroaches

82 ----> x cockroaches // then 82% will be immunes.

Now, multiply 82 by 2.200.000 and divide the result by 100:

`x =(82*2.200.000)/(100) = 1.804.000`

1.804.000 cockroaches are immune.