The price of 80 apples is equal to that of 120 oranges. The price of 60 apples and 75 oranges together is Rs.1320. The total price of 25 apples and 40 oranges is	Choose the correct choice from the following answers
A) 620  B) 610  C) 630  D) 625  E) 635

Rationale: "let the price of one apple = a and price of one orange = b the price of 80 apples is equal to that of 120 oranges 80 a = 120 b = > 2 a = 3 b ⇒ b = 2 a / 3 - - - - - ( equation 1 ) price of 60 apples and 75 oranges together is rs . 1320 = > 60 a + 75 b = 1320 = > 4 a + 5 b = 88 ⇒ 4 a + 5 ( 2 a ) / 3 = 88 ( ∵ substituted the value of b from equation 1 ) = > 12 a + 10 a = 88 × 3 = > 6 a + 5 a = 44 × 3 = > 11 a = 44 × 3 = > a = 4 × 3 = 12 b = 2 a / 3 = ( 2 × 12 ) / 3 = 8 total price of 25 apples and 40 oranges = 25 a + 40 b = ( 25 × 12 ) + ( 40 × 8 ) = 300 + 320 = 620 answer is a ."
Answer: A