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No. Only dividing y by 2 will double the value of x/y. The other options will not double the value of x/y.
Option (i)- The value of x/y will be reduced as x/(y x 2)
Option (iii)- The value of x/y will remain the same (x X 2) / (y X 2)
Option (iv)- The value of x/y will remain the same (x/2) / (y/2)
Option (v) - The value of x will increase (x X 2)/ (y/2)
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By multiplying also, the result will be same