A chemical engineer has tested 56 water samples. These samples make up 25% of the total number of samples that need testing.??
Select from the drop-down menu to correctly identify the total number of water samples that need testing.

There are a total of water samples to be tested. choices a. 1.4 b. 14 c. 168 d. 224

25% can be written as 1/4.

What This tells you, is that 56 is one fourth of the total amounts of samples needing to be tested. Therefore, 56 x 4 is the total amount.

56 x 4 = 224

So 224 is the correct answer.

I hope this Helps!

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