⇒ Average = sum of elements / number of elements Given, Let the price of an orange and an apple be Rs. a and Rs. b. Given, The average price of 40 oranges is 80% of average price of 20 apples in a basket. The average price of 40 oranges = (40 × a)/40 = a The average price of 20 apples = (20 × b)/20 = b ⇒ a = (80/100) × b ⇒ a = 4b/5 ⇒ b = 5a/4 Given, The price of a pineapple is 40% of price of an orange. Let the price of a pineapple be Rs. m. ⇒ a = (40/100) × m ⇒ a = 2m/5 ⇒ m = 5a/2 Given, a = Rs. 8 Then, ⇒ b = 5a/4 = (5 × 8)/4 = Rs. 10 ⇒ m = 5a/2 = (5 × 8)/2 = Rs. 20 If 5 more pineapples are added into the basket of price Rs. 20 each then, ⇒ Total price of 5 pineapples = 5 × 20 = Rs. 100 ⇒ Total price of 40 oranges = 40 × 8 = Rs. 320 ⇒ Total price of 20 apples = 20 × 10 = Rs. 200 Total price of 40 oranges, 20 apples and 5 pineapples in a basket = = 100 + 320 + 200 = 620 Average price of a basket contains 40 oranges, 20 apples and 5 pineapples = = 620/(40 + 20 + 5) = 620/65 = 9.53 Average price of a basket contains 40 oranges, 20 apples and 5 pineapples is Rs. 9.53. Alternate Solution: Price of an orange = 8 So, price of an apple will be = 10 And Price of a pineapple will be = 20 Average price of a fruit = (8 × 40 + 10 × 20 + 20 × 5)/65 = 620/65 = 9.53