solve(1) in+a+test+5+marks+are+given+for+correct+answer+and+-2+marks+are+given+for+incorrect+answer.Rahul+answered+all+the+questions+and+scored+40+marks+though+he+got+16+correct+answers.Find+the+number+of+incorrect+answers+
Anonymous:
Use allegation and mixture
The right answer is 20
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16×5 - 2×y =40
-2y=40 -80
Y= 40/2
Y=20 incorrect
-2y=40 -80
Y= 40/2
Y=20 incorrect
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