# Chapter 7 - Measurement - 7.1 Problem Solving with U.S. Measurement Units - 7.1 Exercises: 57

$140 #### Work Step by Step Given, Dan orders supplies for the science labs. Each of the 24 stations in the chemistry lab needs 2 ft of rubber tubing. The cost of rubber tubing is$8.75 per yard. To find the cost to equip all the stations. Step 1. The length of each station is 2 ft. There are 24 stations so total length is 24 * 2= 48 ft. Step 2. Cost given is in per yard, so we need to convert the length in yards. Use a unit fraction with yard (the unit for your answer) in the numerator, and feet (the unit being changed) in the denominator. Because 3 ft = 1 yard, the necessary unit fraction is (1 yard)/(3 feet) Multiply 48 ft times the unit fraction. 48 ft * (1 yard)/(3 feet) = 16 yard Step 3. Now to calculate the cost per yard. We need to multiply $8.75 to 16 yard. 8.75 * 16 =$140 Therefore \$140 will cost to equip all the stations.

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