solve 5 question and 6 question
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a/b=1/3 implies a=3 and b=1
also c/d=1/4 implies c=4 and d=1
therefore 3ad-2cb/5cb-3ad=1/11
also c/d=1/4 implies c=4 and d=1
therefore 3ad-2cb/5cb-3ad=1/11
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answer is 2
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