Question

a boy gets 3 marks for each correct form and losses 2 marks for each incorrect from he does 24 sums and obtain 37 marks the number of correct sum
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Answer 1

Let the number of correct answers be x and number of wrong answers be y

Now x + y = 24 ...........................eq1             (Given)

3x - 2y = 37.......................................eq2

Multiplying eq1 by 2 we get

2x + 2y = 48........................................eq3

Now solving eq2 and eq3 using elimination method, we get :

x = 17 and y = 7

correct answers = 17

wrong answers  = 7