Exam 16: Combined Operations With Decimal Fractions

Perform the operation indicated and round to two places: 455.1 ÷ 15.2=

Perform the operations indicated and round to three places: 156.45 x 10.62 x 0.21 =

Two technicians from the All Cool Company worked on a repair job. One technician earns $16.50 an hour and worked 14.5 hours. A second technician, who earns $15.75 an hour, worked 12.75 hours. How much did the All Cool Company have to pay for labor for these two technicians?

Perform the operation indicated: 399.845 - 27.262

Express the common fraction 7/17 as a decimal fraction rounded to four decimal places.

If a technician is paid $17.00 per hour and works 37.5 hours, to determine how much the technician earns you should multiply to solve the problem in the most efficient way .

A store replaced 65 of its 150-watt incandescent light bulbs with new 45-watt compact fluorescent light bulbs. The light output is the same; the difference in wattage is the difference in heat output by the bulbs. If 1 watt is equal to 3.41 Btu for each hour the light is on, how much less heat must be removed by the air conditioner each hour because of changing the light bulbs?

Perform the operation indicated: 119.111 8.27 $\underline { + 5.46 }$

When solving problems with combined operations, sometimes it will require more than one step to solve the problem.

At 5° F, the latent heat of vaporization for R-124 is 70.7 Btu/lb. This means that when 1 pound of R-124 vaporizes at 5° F, 70.7 Btu of heat are removed from the surroundings. How many pounds of R-124 must vaporize at 5° F in order to remove 25,992.966 Btu of heat from the surroundings? (Round answer to two decimal places.)