1.

If a : b = 7 : 2, find the ratios (i) b : a (ii) a + b / b .

Answer»

(i) a : b = 7 : 2 

∴ b : a = 2 : 7 .......... invertendo

(ii) a / b = 7 / 2 

∴ a+b / b  = 7+2 / 2 =9/2 .......... componendo



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