Asked by usha

at a bookfair there was an equal number of chinese books and english book. at the end of the day 84 chinese and 156 english books were sold. the ratio of english books to chinese books became 7:4.how many books were there altogether at beginning of the day
Answered by Steve
(x-84)/(x-156) = 7/4
x = 252

Note that 252 is not the answer to the question.
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