Question

Tom solved (4a+7b+c) sums out of which only (a-4b+3c) were correct. How many sums were correct

Answer 1

If you have asked for no. of wrong questions, I have given the answer below but if you still want to find the no. of questions correctly answered, is given straight in the question.

Let the no. of wrong answers be x,

a - 4b + 3c + x = 4a + 7b + c

x = 3a + 11b - 2c

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