Key to White's New Complete Arithmetic: For Teachers

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Van Antwerp Bragg & Company, 1884 - Arithmetic - 129 pages

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Page 13 - If the numerator and denominator of each fraction is multiplied (or divided) by the same number, the value of the fraction will not change.
Page 102 - In any proportion, the product of the extremes equals the product of the means.
Page 110 - The areas of circles are to each other as the squares of their diameters.
Page 124 - Find i the distance of the foot of the ladder from the base of the wall ii the distance of the top of the ladder above the ground.
Page 13 - ... have disposed of 60 eggs, and to lose 4 pence, she must have had 240 eggs. 9. A and B can, together, do a piece of work in 8 days ; A and C can, together, do it in 9 days ; B and C can, together, do it in 10 days. How many days would it require for each to perform the work alone ? SoU.ion.
Page 97 - B together can do £ plus £, or -fa, of it in a day ; if they can do -fa of the work in a day, it will take them as many days to do the work as fa is contained times in ff, which is Щ : A and B can do the work in Щ days.
Page 97 - Gray can reap £ of it in 1 day. Hence, both can reap £ + J = żJ of it in a day, and it will take them as many days to reap the whole of it as ^ĦJ is contained times in 1, which is JJ = 2Д times.
Page 97 - A can do a piece of work in 4 days, B in 5 days, and С in 6 days: in what time can they together do it ? 65.
Page 97 - A can do the work in 6 days, he .can do £ of it in one day ; and...

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