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Answer :

Let the number to be filled in the blanks be a, b, c and d respectively.

Therefore, \(\frac{1}8=\frac{4}a\)

\(\Rightarrow a=32\)

\(\frac{1}8=\frac{7}b\)

\(\Rightarrow b=56\)

\(\frac{1}8=\frac{12}c\)

\(\Rightarrow c=96\)

\(\frac{1}8=\frac{20}d\)

\(\Rightarrow d=160\)

Hence, we have the required value of bases as:

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