3 books, 2 copies and a pen cost 320 And 2 book, 3 copies and 4 pen cost 230 what will the cost of 1 book 1 copy and 1 pen

Answer 1

let b the number of books

let c be # of copies

let p be # of pen

first case is 3b+2c+p=320

second case is 2b+3c+4p=230

If you add these two equations vertically, we would get 5b+5c+5p=550 .we would rewrite it as 5(b+c+p)=550 and divide each side by 5, then we would get the answer as 110.