By what number should we multiply\[\frac{-16}{21}\], so that the produ

1.	By what number should we multiply\[\frac{-16}{21}\], so that the product is\[\frac{4}{7}\]?
A.	\[\frac{-3}{4}\]
B.	\[\frac{-1}{4}\]
C.	\[\frac{3}{5}\]
D.	\[\frac{2}{5}\]
Answer» B. \[\frac{-1}{4}\]

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By what number should we multiply\[\frac{-16}{21}\], so that the product is\[\frac{4}{7}\]?

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