let x be the unknown
(50+70+x)/3=55
50+70+x=(55x3)
50+70+x=165
transpose 50 and 70 to the other side and let x remain
x= 165-50-70
x=45%
check:
if each test is 100 items..then..
50% of 100 for science=50
70% of 100 for english=70
45% of 100 for math= 45
and mean is the average of the three subj..then..
(50+70+45)/3=55
In an examination,Dada scored x% in maths,50% in science and 70% in English studies.if his mean score for the three subject was 55%, find x
3 answers
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The sum of 6 and one-third of x is one more than twice x. find x