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196 – 49 = 147 (Rule iv), Then, 147 ÷ 21 = 7 (Rule v) 18 × 7 = 126 (Rule ii), Then, 126 - 9 = 117 (Rule iv)
What is the fourth proportion of 16, 20 and 24?
Divide 297 into two parts such that one may be to the other as 2:9.
If A:B:C = 3:4:7 and (C - A + B) = 48, then find the value of (2C + A2).
If A varies directly as B and inversely as C and A = 6, B = 3 and C = 5, what is the value of A when B = 5 and C = 2?