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THE NEW  STUDENT'S  REFERENCE  WORK                                  2213

RULES FOR FINDING THE VOLUME OF SOLIDS.

1.   The volume of a regular prism is equal to the product of the area of its base by its altitude.

2.   The volume of a cylinder is equal to the product of the area of its base by its altitude.

3.   The volume of a pyramid is equal to one-third the product of the area of its base by its altitude.

4.   The volume of a cone is equal to one-third the product of the area of its base by its altitude.

5.   The volume of a sphere is equal to | the product of its radius

and its convex surface.

EXERCISE 45. (REVIEW.)

1.   Complete these proportions:

7:     =20 :* i:A=       :i

2.   If 18 horses eat 80 bu. of oats in 4 weeks, how many bushels will 16 horses eat in the same time!

3.   Find the 3rd power of f.

4.   Find the square root of 65.1249.

5.   A ship was valued at $75,000, and was insured for f of its value at 3|%. Find the premium.

6.   A man bought a farm of 80 A. of land for $3200, and sold it at a profit of $9.50 an acrei. What was the gain per cent?

7.   Find the side of a square that contains as many square feet as

an oblong 210 ft. X 52^ ft.

•

8.   Write the decimal for

\%A%, \%-

9.   How many pecks of potatoes are there in 48 bu.y 3 pk. and 6 qt. f Find the cost of the same at 40c per peck.

10.   How many bricks 8 in. X 4 in. will be required to lay a sidewalk 4 rd. long and 6 ft. wide!

EXERCISE 46.

Henry Brown has on his wood-lot a pile of wood 54 ft. long and 4 ft. high, which he sells to Joseph Taylor at $7.25 per cord,

1.   Write how much money he should receive.

2.   Write such a bill for the wood as Mr. Brown would make out. Receipt it yourself for Mr. Brown.