book Maths Puzzle Numerical Ability

For the Arithmetic sequence 3x + 5y , 4x + 2y, 5x- y, 6x - 4y.....
a.Find d _ b. Find the 40th term _____________

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book Other Question

81 kilometers= how many millimeters? Calculate the least velocity of projection required to give a missile a horizontal displacement of 500 m if the angle of projection is 24 degrees.