A can complete a work in 20 days and B in 30 days. A worked alone for 4 days and then B completed the remaining work along with C in 18 days. In how many days can C working alone complete [SSC CGL 2012 (b) 68 (c) 72 (d) 90 the work? a) 12
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In a competitive exam, 6 marks are awarded for every correct answer and 2marks are deducted for every wrong answer. Arun attempted all questions and scored 70marks .He answered 7questions incorrectly .Find the total number of questions in his exam.
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Work done by A in 4 days = 420=15420=15
Remaining work = 1−15=451−15=45
Let C can working alone complete the work in x days.
According to the question,
1830+18x=451830+18x=45
=> 18(x+30)×518(x+30)×5=4×30x4×30x
=> 90x+2700=120x
=> 30x=2700
x=90 days
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