First part = x and second part = 84 – x =`(x/4)/((84-x)/5) = 1/2` ⇒ x/4 × 5/(84-x)= 1/2 ⇒ 10x = 336 - 4x ⇒ 14x = 336 ⇒x = 24 Second part will be 84 – 24 = 60 Required percentage = 24/60 × 100 = 40%
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