Kevin has a phone number of 10 digits with some of its digits missing The missing digits in the number are represented by question marks (?). But Kevin remembers that the given phone number was the minimum number possible that is divisible by 3. Write a program to replace the question marks by single-digit numbers such that you find the phone number which is the minimum number possible that is divisible by 3.

Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]