exam Maths Puzzle Numerical Ability

a worker is hired for 20 days. on the first day he makes 1 cent on the 2nd day he makes 2 cents and the pay doubles each day. What is the total pay?

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To whom may it concern,

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Peter and Jane together have $90. If Peter gave Jane $16, he would then have $14 less than Jane. How much does Peter has originally ?

Thank you. Solve the equation: 3/5x+7=x-4/10+2