2.A mixture of paint is prepared by mixing 1 part of red pigments with 8 parts of base. In the following table, find the parts of base that need to be added.

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: