Hey guys,
I was trying to solve the DS questions in MGMAT 4th edition, guide 2, chapter 6 (page 89) and I was struggling to set up an equation for #77 in OG 12. I have gone through the book but it seems like, this guide did not cover on how to tackle such questions and writing equations for stmt 1 of #77....do you guys have any other source that could help me solve problems like this?