The Practical Arithmetic: Designed for Such Institutions As Require a ...
The Practical Arithmetic: Designed for Such Institutions As Require a ...
George R George Roberts Perkins
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how long to count 76 ? how long to count 226 ? How many can he count in 6 sec- onds ? how many in 13 seconds ? how many in 80 seconds ? how many in 75 seconds? how many in 17 seconds ? how many in 37 seconds ? Practice. § 116. Practice is the employment of the ratio of a miJ- tlpli^ or divisor to its unit of the same kind, instead of the employment of the given multiplier or divisor itself. Thus, if a bushel of apples be worth 50 cents, what will 18^ bush- els be worth ? This answer may be obta...ined by multiply- ing 60 cents by 18 J giving $9'25. But the ratio of 50 cents to $1.00 is Y^=i. Therefore, to find how many dollars l&J- bushels arc worth, it is only necessary to multiply 18 J, the number of bushels, by \ ; that is, to divide 18^ by 2. "What is the interest of $740 for a yeai* and 6 months ? For a year the interest is $740 X 006 =$44*40. Now as 6 months is J of a year, we find the interest for 6 months, by taking J of $44*40, which is $22*20. Hence the interest for one year and 6 months is $)t4-4O+$242*20=$66*60.
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