## Basic College Mathematics (10th Edition)

Multiply to find the amount of chlorine needed for 30 days. $750mL\times30=22,500mL$ Move the decimal to convert mL to L. $22,500mL=22.5L$ Divide to find the number of 4L containers. Round up to ensure the chlorine does not run out. $22.5\div4=5.625\approx6$ Multiply to find the total amount in the 6 containers. $4L\times6=24L$ Subtract to find how much is left over. \$24L-22.5L=1.5L