In a compititive examination , one mark is awarded for every correct answer while 1/4 mark is deducted for every wrong answer . A student answered 100 questions and got 80 marks. How many questions did he answer correctly?(Use Cramer's rule to solve the problem).

In a compititive examination , one mark is awarded for every correct answer while 1/4 mark is deducted for every wrong answer . A student answered 100 questions and got 80 marks. How many questions did he answer correctly?(Use Cramer's rule to solve the problem).

Matching exercise

Match the items on the right to the items on the left.

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