exam Maths Puzzle Numerical Ability

I am thinking of a number. If you multily my number by 2 and then add 3, you will get 55. What is my number?

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whats 50% of 120 hello sir....im at a loss on how to find the procedure on these solutions on sequences.. ty for ur help...S=610,n=20,a=2.. how do i find d=..?
S=sum,n=terms,a= first term... i kn