There are 20 questions in a short test 5 marks are awarded for every correct answer, but
marks are deducted for every wrong answer or empty answer. I have 68 marks. How many
questions have I answered correctly?
Answers
Answered by
1
Answer:
8y
Step-by-step explanation:
x=20-y
5x=68+3y
by substituting the first equation into the second equation, we have
5(20-y)=68+3y
100-5y=68+3y
100-68=3y+5y
34=8y
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