In a mathematics test, there are 60 questions. There is 2 marks for every correct answer and, 1/3 is deducted for each unattempted question or wrong solution. If Zaheer got 50 marks, how many questions did he answer correctly?
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2
Answer:
20
Step-by-step explanation:
Let the correct question is x
So, incorrect questions will be (50-x)
ATQ,
Correct questions x 2 marks + Incorrect questions x (-1/3) = 50
x * 2 + (50-x) * (-1/3) = 50

Taking LCM

5x = 100
x = 100/5
x = 20
20 questions he answered correctly.
Hope it helps
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