What is the central angle corresponding to number of members (both male and female) in health club B ?

Only 50% of the members (both male and female0 in health club E have lifetime membership. If the number of females in health club E who have lifetime membership is 44, what percent of male members in health club E have lifetime membership ?

What is the average number of female members in health clubs C, D and E?

What is the central angle corresponding to the number of members (both male and female) in health club A ?

A water tank has one inlet, A and one outlet, B. A takes 5 hours to fill the empty tank, when B is not open and B takes 8 hours to empty the full tank, if the tank  is three fifth full, how much time will it take to fill the tank completely when both A and B are opened simultaneously ?(in hours)

In a village, 30% of the villagers belong to upper economic class. The number of villagers who belong to middle economic class are 3/2  of the number of villagers who belong to lower economic class. If 6860 villagers belong to lower economic class, what is the population of the village ?