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1. A lighting circuit can supply 1,200 watts of incandescent
light. How many 150-watt fixtures can it support?
2. A carpenter cuts four pieces of weather stripping from a
roll 180 inches long. How much weather stripping remains on the roll if the
pieces were 40 inches, 40 inches, 34 inches, and 34 inches long?

1. A contractor hired three plumbers to work nine hours per
day for five days and two laborers to work seven hours for one day. What was the
total number of hours worked?
2. How many bundles of shingles are needed to cover a
two-part roof if one part is 400 square feet and the other part is 600 square
feet? It takes three bundles of shingles to cover 100 square feet.

The electrical code requires that no point on a wall can be
more than 6 feet from an electric outlet. How many electric outlets are
required for the rooms, as shown in Figure 6-7? Do not allow for wall
thickness. (Hint: Receptacles are required to be placed within 6 feet of each
doorway. Receptacles can be spaced 12 feet apart on a continuous wall run)
Figure 6-7

A cylinder of refrigerant weighs 24 pounds 4 ounces. If you
use 28 ounces to charge a system, what is the weight of the cylinder when you
finish charging? (Hint: Change the pounds and ounces to ounces. There are 16
ounces in a pound.)

A manufacturer recommends one lighting fixture for every 80
square feet of ceiling area. In a room with a suspended ceiling, 4 tiles wide
by 15 tiles long, how many fixtures should be installed? (Each tile is 8 square
feet.) 68. If you cut 13 pieces, each 40 inches long, from a supply of 5 pieces
of lumber, each 120 inches long, how much lumber remains?

If two people can install 75 square feet of siding per hour,
how long will it take for four people working at the same speed to side a house
with walls of 16 feet × 10 feet, 12 feet × 10 feet, 20 feet × 18 feet, and 13
feet × 20 feet?

1. If you buy a set of wrenches for $29.95, a pair of pliers
for $8.50, and a level for $22.49, what is the total cost of the tools?
2. If three motors draw 2.2 amperes, 5.8 amperes, and 8.5
amperes, what is the total amperes drawn by the three motors?

1. What is the profit if the contractor receives $90,000 for
the house in question 18?
2. You pay $2,915.45 for materials and $300 for labor to
install an air conditioner. What is your profit if you are paid $3,850 for the
job?

The total current indicated in Figure 7-4 divides at point
A. How much current exists at point B?
Figure 7-4

1. The rating stamped on an oil burner nozzle indicates how
many gallons of oil are sprayed each hour. If the nozzle is marked 0.65 and it
sprays for 8.75 hours, how many gallons are sprayed?
2. If 0.8 square of shingles can be applied in one hour, how
long will it take to apply 8.25 squares?