if two quantities 'x' and 'y' then x x y =k (constant)
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If two quantities x and y vary directly with each other, then x/y = k = constant. Since, in direct proportion, both x and y increases or decreases together such a manner that the ratio of their corresponding value remains constant. Hence, option (a) is correctRead more on Sarthaks.com - https://www.sarthaks.com/859043/if-two-quantities-x-and-y-vary-directly-with-each-other-then
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