marks obtained by rashmi in English Hindi science and so science are76,74,82,77 how many marks should she score in mathematics so as to get 80 marks average
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let, 'x' be the mark obtained by rashmi in mathematics
average= (76+74+82+77+X)÷5 =80
(309+X)÷5=80
(309+X) =80×5
309+X. =400
X. = 400-309
X = 91
therefore; mark obtained by rashmi in mathematics =X= 91
average= (76+74+82+77+X)÷5 =80
(309+X)÷5=80
(309+X) =80×5
309+X. =400
X. = 400-309
X = 91
therefore; mark obtained by rashmi in mathematics =X= 91
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