Question

If 24 drops of chemical "X" in 50.4 ml solution can cause the microbe population to decrease, the solution required for every 1 drop of "X" is .

• A. 2.0 ml
• B. 2.1 ml
• C. 3.0 ml

Answer 1

The correct option is B 2.1 ml

Amount of solution required for 24 drops of "X" = 50.4 ml

To find the unit rate, we have to divide the amount of solution by the number of drops of "X".

Unit rate = 50.4$÷$24

$$\begin{array}{c}2.1\\ 2450.4\\ -\underset{–}{48}-2\\ 240\\ -\underset{–}{24}0\\ 0\end{array}$$

Unit rate = 2.1 ml.

Hence, the amount of solution required for 1 drop of "X" is 2.1 ml.