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2186                                                                 ARITHMETIC

2,   How much will it cost to carpet a room 15 ft. by 12 ft. with carpet % yard wide at $1.20 a yard, if the breadths run lengthwise!

3.   A room 24 ft. by 20 ft. is to be carpeted with carpet 1 yd. wide at 85c per yard. Which will be cheaper, to lay the breadths lengthwise or crosswise f

PAPERING.

Wall papers are usually y2 yard wide and 8 yd. long for a single roll, 16 yd. for a double roll. t

The usual way of reckoning the number of rolls required to cover the walls is:

1.   Measure the distance around the room.

2.   Deduct the width of doors and windows.

3.   Divide the difference by the width of the paper to find the number of strips.

4.   Divide the length of a roll by the height of the wall to find the number of strips in a roll.

5.   Divide the strips required for the room by the strips in a roll. This gives the number of rolls required.

What will it cost to paper the walls of a room 16 ft. long, 15 ft. wide and 9 ft. high at 45c a roll? There are 2 doors 3l/2 ft. wide and 3 windows 3 ft. wide.

2(16 ft. + 15 ft.) =62 ft. distance around the room.

7 ft. -f- 9 ft. = 16 ft. width of doors and windows.

62ft —16 ft. = 46 ft.

46 ft. ~ 14 ft. (| yd.) = 30f or 31 strips.

16 yd. or 48 ft. -f- 9 ft. (height of room) =5+. We see there can be but 5 strips in a double roll.

31 -f- 5 = 6| double rolls, which would be equivalent to 13 single rolls.

13 X .45 = $5.85 cost of paper.

PLASTERING.

To estimate the cost of plastering a room, find the total area of walls and ceiling. Take from this ^ of the surface of doors and windows. Multiply by the price per sq. yd.

EXERCISE 28.

1.   What will be the cost of plastering a room 14 ft. long, 12 ft. wide, 9 ft. high, at 35c per sq. yd. f  There are 2 doors 7 ft. by 3% ft., and 2 windows 6 ft. by 3 ft.

2.   Find the cost of plastering a room 24 ft. by 18 ft. by 10 ft., at 30c per sq. yd. There are 2 doors 7 ft. by 3 ft., and 3 windows 6 ft. by 3% ft.