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126. If the cotton crop of Mississippi decreased 5% in a certain year, amounting to 1,347,100 bales, how many bales were produced before the decrease?

127. The world's production of copper in a certain year was 575,000 long tons, of which the United States produced 308,000. Of the United States, the largest producers were Michigan, 192 million pounds, and Montana, 27% more than Michigan. What per cent of the world's production was that of the United States? of Michigan? of Montana?

128. What is the present worth of (or sum which put at interest will amount to) $230.25, due in 3 yr. 9 mo. 18 da., money being worth 6%? If we call the difference between the present worth and the given sum (or future worth) the true discount, as was formerly the custom, find the true discount in this case.

129. What is the present worth (see Ex. 128) of $151.33, due in 4 mo. 15 da., money being worth 6%?

130. What is the present worth and true discount (see Ex. 128) of $161.50, due in 1 yr. 3 mo. 10 da., money being worth 6%?

131. The following are some of our greatest coal-producing states, with the number of tons produced by each in a certain year, and the value of the coal at the mines. Find the value per ton in each case.

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132. Four bells toll at intervals of 3, 4, 5, and 8 seconds respectively, commencing at the same instant. At what intervals will they toll simultaneously?

133. Mr. Jameson has a balance of $2703 due him from King & Co., commission merchants. He writes them to close his account by buying for him as much as possible of a certain line of goods after deducting their commission of 2% How much do King & Co. pay for the goods?

134. Two trains start at the same time, one from Albany for New York, and the other from New York for Albany. The first runs at the rate of 42.4 mi. per hour, and the second 52.8 mi. The distance between the cities being 147 mi., how far apart will the trains be in 1 hr. 15 min.?

135. A train leaves New York at the same time that one leaves Albany, the former traveling 54 mi. an hour and the latter 10 mi. less per hour. If they maintain this rate and travel towards each other, how long after starting and how far from Albany will they meet? (See Ex. 134.)

136. Slaters have this rule for finding the number of slates per square (100 sq. ft.): Subtract 3 in. (for overlapping) from the length of the slates; divide 14,400 sq. in. (the number in a square) by the area of each slate after making the deduction. Explain this by a drawing, and find the number of 8" x 14" slates needed per square.

137. In a certain gold mine 450 cans of explosives, of 25 lb. each, were used in a blast which broke up a mass of gravel 270' x 180' x 100'. At this rate, how many pounds of explosives were used per 1000 cu. ft. of gravel broken up? The blast cost $6000. How much did it cost per 1000 cu. ft.? If the gravel yielded 23.49 per cubic yard, how much gold was taken out?

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The avoirdupois pound contains 7000 gr., the Troy pound 5760 gr.

3.2 grains = 1 carat (diamond weight).

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City property is usually measured by feet and decimal fractions of a foot; farm property, by rods or chains.

Surveyors' Table of Square Measure

16 square rods (sq. rd.) = 1 square chain (sq. ch.).

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640 acres 1 square mile (sq. mi.).

36 square miles = 1 township (tp.).

A square rod was formerly called a perch.

A quarter of an acre (40 sq. rd.) was formerly called a rood.

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Now, for convenience in counting, 500 sheets are more often called a ream; and the word quire is used only for folded note paper, other paper being usually sold by the pound.

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