A Key to the Western Calculator : Containing the Solution of All the Examples And Questions for Exercise ...
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DIRECT PROPORTION. Page 66. Quest. 2. Horses 18? 1A , , , C 60 horses ™^? 10 bushels. 5^5 0rSe days 20 5 £36 days m 10x60x36 Then— —--— = 10x3x2 = 60 bushels. 18x20 Or thus, horses days bu. 10*60*36 As 18 : 20 : : 10 Then * * =60 bushels. 60 : 36 18x20 Or, by two statings, horses bn. horses As 18 : 10 : : 60 : 33| bushels. days bu. dai/s bushels. And, as 20 : 33j : : 36 : 60 as before. 48 DOUBLE RULE OF THREE Page 66. Stated thus, Or thus, 3. Men 7 ~) _ A 1K C21 men men days lbs. days 14 5 1 3 ...days 7—14—56 21— 3 56x21 x3 Then-— — ——=4x3x3=36 pounds 7x14 r Or by two statings, men men lb. lb. As 7 : 21 : : 56 : 158, and days days ' lb. As 14 : 3 : : 168 : 36 pounds. Stated, thus, Or thus, Students 8 "] dolls. C 12 stud. stu. mo. dolls. I 384 1 8— 6—384 months 6 10 mo. 12—10 Then, - 4X o 12 !
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