TCS Company Numerical Ability Percentage

IF X IS ADDED TO BOTH NUMENATOR AND DENOMINATOR IN FRACTION 2/3 AND 20/3,THEN FRACTION BECOME EQUAL.THE FACTOR OF X IS??

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TCS Other Question

a,b,c are positive numbers such that a+b+ab= 8, b+c+bc=15 and c+a+ca = 35
What is the value of a+b+c+abc?
What is the 30th number in the series 1,2,4,7,11,16...