In an exam a boy got 95 marks in English and maths,105 marks in English and history and 80 marks in maths and history. find his marks in each subject.
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given eng +mat = 95 .......eq 1
eng +his = 105.....................eq 2
mat + his =80........................eq3
subtract eq 2 from 1
will get his -mat=10 .........eq4
now by adding eq 3 and 4
mat + his -mat+his= 80+10
2 his =90
his =45
by substituting history value in 2 and 3
eng =105-45=60
mat=80-45=35
therefore history :45 , maths : 35 , english : 60
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