exam Maths Puzzle Numerical Ability

The arithmetic sequence x,2x-20,3x-32,...has D1=16. What is the formula for the nth term ?

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can you help me in solving this problem:

if one-half of one integer is subtracted from three-fifths of the next consecutive integer, the difference is 3. what are the two integer. how do i solve this equation 1/m + w = c/m?