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
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water samples to be tested.

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

When the ball has traveled a distance of

At oaknoll school, 90 out of 270 students on computers. what percent of students at oak knoll school do not own computers? round the nearest tenth of a percent.