a , b and c have rs . 700 between them , a and c together have rs . 300 and b and c rs . 600 . how much does c have ?
"a + b + c = 700 a + c = 300 b + c = 600 - - - - - - - - - - - - - - a + b + 2 c = 900 a + b + c = 700 - - - - - - - - - - - - - - - - c = 200 answer : a"
subtract(add(300, 600), 700)