The Normal Mental Arithmetic: a Complete And Thorough Course By Analysis And Induction
The Normal Mental Arithmetic: a Complete And Thorough Course By Analysis And Induction
Edward Brooks
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21. A penholder cost 12 cents, and f of its cost is i of J of the cost of the pen ; required the cost of the pen. 22. What is f of f? Solution.—} of \ is ^ ; and if J of \ is ^, J of f is 4 times ^, which are ^, and § of J are 2 times jfe, or -fa. Therefore f of* = &. 23. What is i of f? Joff? £of£? 24. What is i of *? ioff? | off? 25. What is £ of £? iofj? JofA? 26. What is i of f? |of£? £off? 27. What is f of *? foff? J off? 28. What is f of *? ft of f? fof^? 29. Since f of f equals ^, in wha...t manner may we ob- tain the same result by omitting the analysis ? 30. How, then, shall we find a fractional part of a frac-. tion without going through with the analysis ? 31. What is f of f? foff? foff? 32. What is f of f? fof|? I off? 33. What is f of |? fof^foftf? 34. A boy had f of a dollar, and gave away £ of it ; how much did he give away ? 35. A man, owning £ of the stock of a bank, sold f of it; how much stock did he sell ? 36. Bowman, having f of a melon, gave f of it to Martin ; what part of \ remained?
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