A science teacher collects 19 pints of lake water for a lab she is teaching. The lab requires each student to use 4 fluid ounces of lake water. If 60 students are participating, how many pints of lake water will the teacher have left over?

4 pints

Step-by-step explanation:

The conversion from pint to ounce is:

1 pint = 16 ounces.

The teacher collected 19 pints, that is, 19*16 = 304 ounces of lake water.

If there are 60 students, and each of them use 4 ounces, the total of lake water used is 60*4 = 240 ounces.

So, the amount of lake water left is 304-240 = 64 ounces, that is, 64/16 = 4 pints.

cross multiplying, we get :

⇒ (3) × (5) = (9) × (x)

⇒ 15 = 9x

he answer is x=1x3 because x=1 to x=3