Solution
Given: Terms are in ratio 7:11
let's say first term $$7x$$ and second term $$11x$$
adding $$y$$ to each term, it will be $$7x+y$$ and $$11x+y$$
and its ratio will be 3:4
hence $$7x+y$$ : $$11x+y$$ = 3:4
on solving above equation we get $$5x$$ = $$y$$
hence adding number should be a multiple of 5.
answer will be (D)
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