Answer:
The total number of water samples to be tested are 224 .
Option (D) is correct .
Step-by-step explanation:
Formula
[tex]Percentage = \frac{Part\ value\times 100}{Total\ value}[/tex]
As given
A chemical engineer has tested 56 water samples.
These samples make up 25% of the total number of samples that need testing.
Part value = 56
Percentage = 25%
Put all the values in the formula
[tex]25 = \frac{56\times 100}{Total\ value}[/tex]
[tex]25 = \frac{5600}{Total\ value}[/tex]
[tex]Total\ value= \frac{5600}{25}[/tex]
Total value = 224
Therefore total number of water samples to be tested are 224 .
Option (D) is correct .
