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

2.1 oz

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2.2 oz

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2.4 oz

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Solution

The correct option is A 2.1 oz
Amount of solution required for 24 drops of "X" = 50.4 oz

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

Unit rate = 50.4 $\div$ 24

$\begin{matrix} 2.1 24 50.4 - 48 - - - 24 - 24 - - - 0 \end{matrix}$
Unit rate = 2.1 oz.

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

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