1. The ratio of three numbers is 2 : 5 : 7. If their product is 1890, then what is the sum of the three numbers?
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By: anil on 05 May 2019 02.05 am
Let the numbers be $$2x,5x$$ and $$7x$$ Product = $$(2x) imes(5x) imes(7x)=1890$$ => $$x^3=frac{1890}{70}=27$$ => $$x=sqrt[3]{27}=3$$ $$ herefore$$ Sum of numbers = $$2x+5x+7x=14x$$ = $$14 imes3=42$$ => Ans - (C)
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