other Exam Numerical Ability

find sum of a+b+c+d if:

a+3b+3d =6160

6a+2b = 7680

12c+3d = 8820

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other Other Question

Find the sum of all prime numbers that divide the greatest common divisor of the numbers

(63^2-4)71 and (961^2+364) Atul and Vikas play marbles every day. It was decided among themselves that Atul being a better player, he should pay Vikas 8 marbles if Vikas wins, but will collect only 5 marbles if Vikas looses. One month they played 26 games and at the end of the month neither of them earned any marbles. How many games did Vikas win?