Is 1/8 equal to 8? If not what is it?
2 answers:
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Keep 6/15 the same and change Division sign into a multiplication sign and flip 4/21 and that will become 21/4. 
126/60=21/10 and 21/10 as a mixed number is 2 1/10 so your answer is 2 1/10. Hoped I helped. :)