Question

A lab is using 155 mice to test a vaccine. Of these, 55 were injected with a 5-mg dose, and 42 with a 15-mg dose. The remaining mice make up the control group. Write an equation, and find the number of mice in the control group.

Answer 1

Subtract the number of mice that received the 5-mg and 15-mg doses from the total number of mice to find that there are 58 mice in the control group.

Step-by-step explanation:

To find the number of mice in the control group for a vaccine test in a lab, you must subtract the number of mice that received both doses of the vaccine from the total number of mice. In this case, we have a total of 155 mice, with 55 receiving a 5-mg dose and 42 receiving a 15-mg dose. We can set up an equation to solve for the number of mice in the control group (C).

The equation would be:

155 = 55 + 42 + C

To solve for C, combine the number of mice that received doses:
55 + 42 = 97

Then subtract this sum from the total:
155 - 97 = 58

Therefore, there are 58 mice in the control group.