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. Parts of red pigment: 1, 4, 7, 12, 20. Parts of base: 8, ?, ?, ?, ?

While mixing, the ratio of pigment and base should be the same. So we have red pigment to base ratio given as 1:8
For red pigment = 4
Base ⇒ 1/8 = 4/x = 32
For red pigment = 7
Base ⇒ 1/8 = 7/x = 56
For red pigment = 12
Base ⇒ 1/8 = 12/x = 96
For red pigment = 20
Base ⇒ 1/8 = 20/x = 160