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In an objective test, a correct answer scores 4 marks, and a wrong answer scores 2 marks. A student scores 480 marks from 150 questions. how many answers are correct?
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- if all ans. right the marks=4*150=600
but score=480
wrong attempt marks=600-480=120
wrong ans.=120/2=60
right ans.=150-60=90. - 12 years agoHelpfull: Yes(47) No(15)
- x+y=150
4x+2y=480
so x=90 and y=60
correct answer =90 - 12 years agoHelpfull: Yes(24) No(16)
- 130 right 20 wrong...
- 12 years agoHelpfull: Yes(22) No(16)
- if all ans. right the marks=4*150=600
but score=480
wrong attempt marks=600-480=120
wrong ans.=120/2=60
right ans.=150-60=90. - 12 years agoHelpfull: Yes(10) No(8)
- total marks if each answer is correct=600
but one obtains=480 (60%)
find 60% of 150 = 90
- 12 years agoHelpfull: Yes(6) No(5)
- student score 480 marks from 150 questions...
if student give 130 right answer then 130*4=520
and 20 wrong answer then 20*2=40
then the score will be 520-40=480
then 130 ans will be correct
- 11 years agoHelpfull: Yes(4) No(1)
- right answer 4marks-480 attempt que-120
wrong answer 2marks-60 attempt que-30
so answer is-135 right 15 wrong - 12 years agoHelpfull: Yes(2) No(9)
- sorry prime no is 229 & 233
- 11 years agoHelpfull: Yes(1) No(2)
- x=60 n y=90
let no of ques he attempts correctly be x
and no of wrong ques be y
then x+y=150
4x+2y=480 - 11 years agoHelpfull: Yes(0) No(0)
- Let the numbers be x, x+1, x+2, x+3, x+4, x+5, x+6
Since their sum equals 1617, we have-
x+(x+1)+(x+2)+(x+3)+(x+4)+(x+5)+(x+6)=1617
7x+21=1617
7x=1596
x=228
Hence the numbers are: 228,229,230,231,232,233,234
Prime Numbers: 229, 231,233 - 11 years agoHelpfull: Yes(0) No(0)
- 90 question`s answers are correct = 90*4 = 360 marks
60 question`s answers are wrong = 60*2 = 120 marks
and Total Marks = 360+120 = 480 Marks
90 correct answers - 11 years agoHelpfull: Yes(0) No(0)
- answer 130
max marks=600(150*4)
marks obtained=480
so 120 marks less than total marks.
thus if she had done 20 question wrongly then she will loose 6 marks per question totaling to 120
hence correctly answered ques 150-20=130 - 7 years agoHelpfull: Yes(0) No(0)
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