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Byju's Answer
Standard VIII
Mathematics
Simplification of an Expression
In an examina...
Question
In an examination, a student scores
4
marks for every correct answer and loses
1
mark for every wrong answer. If he attempts all
75
questions and scores
125
marks, how many questions did he answer correctly?
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Solution
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w
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,
W
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w
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=
75
−
x
,
G
i
v
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n
,
t
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t
a
l
m
a
r
k
s
=
4
×
x
−
1
×
(
75
−
x
)
=
125
⟹
5
x
−
75
=
125
,
x
=
40
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