Tips & Tricks Given that, The average temperature of the town in the first four days of a month = 60 degrees. The average for the second, third, fourth and fifth days = 64 degrees. The temperatures of the first and fifth days were in the ratio 3 : 7. According to the question, Sum of temperatures on 1st, 2nd, 3rd and 4th days ⇒ 60 × 4 ⇒ 240 degrees ... (1) Sum of temperatures on 2nd, 3rd, 4th and 5th days ⇒ 64 × 4 = 256 degrees ... (2) Subtracting (1) From (2), we get Temperature on 5th day - temperature on 1st day ⇒ (256 - 240)° ⇒ 16 degrees Given, The temperatures of the first and fifth days were in the ratio 3 : 7. Let the temperatures on 1st and 5th days be 3x and 7x degrees respectively. Then, ⇒ 7x - 3x = 16 ⇒ x = 4 So, temperature on 5th day is 7x. Then, Temperature on 5th day ⇒ 7 × 4 ⇒ 28 degrees ∴ The temperature on the fifth day is 28 degrees.