Fluid Mechanics - algebra

Please find the solution attached below along with Moody's chart.

Note: I have used standard range of Reynold's number in Question 1 which are 2000 and 4000 which are widely accepted globally. But some authors like to use 2100 or 2300 in place of 2000. So, it is up to you to check what are the definitions of the classifications of flow as per $Re$. For question 2 & 3 most of the data is not given, so I assumed we have to use the data from Question 1 regarding nature of fluid and its properties. Also, for solving Question 3, I have assumed it as a smooth pipe, because friction factor depends on the roughness of the pipe which is also not given in the question.