Question

Mr. Kohl has a beaker containing n milliliters of solution to distribute to the students in his chemistry class. If he gives each student $3$ milliliters of solution, he will have $5$ milliliters left over. In order to give each student $4$ milliliters of solution, he will need an additional $21$ milliliters. How many students are in the class?

• A. $16$
• B. $21$
• C. $23$
• D. $26$

Answer 1

The correct option is D $26$

Let $c$ be the number of students in Mr. Kohl’s class.

The conditions described in the question can be represented by the equations $n=3c+5$ and $n+21=4c$.

Substituting $n=3c+5$ in the second equation $n+21=4c$ gives:

$3c+5+21=4c$

$\therefore c=26$

Hence, there are $26$ students in the class.