Estimate the amount of lime and soda ash required if a split flow treatment system is used to achieve an overall hardness of 100 mg/L as CaCO3. Assume the treatment system residual hardness is 40 mg/L as CaCO3.

The answer for #3 is c but i don't know why

May someone me with these science questions

Afraction can be converted to a decimal by dividing the denominator into the numerator. use a calculator. divide to convert the fractions from part a to decimals. then describe the pattern you see in the decimal.