a , b and c have rs . 500 between them , a and c together have rs . 200 and b and c rs . 320 . how much does c have ?
a + b + c = 500 a + c = 200 b + c = 320 - - - - - - - - - - - - - - a + b + 2 c = 520 a + b + c = 500 - - - - - - - - - - - - - - - - c = 20 answer : d
subtract(add(200, 320), 500)