The ratio of the correct answers to incorrect answers is 7 : 3. The difference between correct and incorrect answers is 20. Find the total number of questions
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X+y= 50
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X+y= 50
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a-b=20....(1)
a/b=7/3
a=7b/3 substitute in (1)
7b/3-b=20
4b/3=20
b=15 substitute in (1)
a=20+15=35
a+b=50
total no.of questions=50
a/b=7/3
a=7b/3 substitute in (1)
7b/3-b=20
4b/3=20
b=15 substitute in (1)
a=20+15=35
a+b=50
total no.of questions=50
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