exam Maths Puzzle Numerical Ability

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5x+12-3x=-2x-13-x

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I need to find the 10th term of the geometric sequence.

a9 = 8; r = .5

thanks Twice the middle digit of a three-digit number is the sum of the other two. If the number is divided by the sum of its digit, the answer is 56 and the remainder is 12. If the digit