He augmented his summer income by painting houses
The bolded pronoun in the given sentence is the word "which". This pronoun is an example of an interrogative pronoun. Interrogative pronouns are pronouns that are used to introduce a question. The antecedents of interrogative pronouns are unknown because it is what is being asked in the sentence that is missing.
While women in Japan were recognized as having equal legal rights to men after World War II, economic conditions for women remain unbalanced.[3] Modern policy initiatives to encourage motherhood and workplace participation have had mixed results.[4]
While a high percentage of Japanese women are college graduates, making up 77% of the part-time work force,[5] they typically earn 27% less than their male counterparts.[6] Traditional expectations for married women and mothers are cited as a barrier to full economic equality.[7] The monarchy is strictly males-only and a princess has to give up her royal status when she marries a commoner.