Work out the sum of the interior angles of any quadrilateral
1 answer:
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Answer: 10
Step-by-step explanation:
Let x be the number of correct problems and y be the number of incorrect problems.
Given: A teacher pays a student 10¢ for every problem in this chapter that the student solves correctly, and fines the student 5 ¢ for every problem done incorrectly.
At the end of 30 problems they do not owe each other any money.
The by considering the given information we have the following equations :-
From (2), we have
Put in (1)
Then,
Hence, the number of correct problems is 10 and the number of incorrect problems is 20.