The average marks of 10 students of a class is 26, where the average marks of passed stidents is 80 and average marks of failed students is 20. find the no. of stidents who passed
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total marks is 26* 10 = 260
.. let passed students be x .. so total marks of passed students is 80x... failed students..its 20* ( 10-x)
80x + 200-20x = 260...
x = 1
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