Answer:
Step-by-step explanation:
Given
no of houses that can be served by water is directly Proportional to the square of diameter
where k =constant
10 cm diameter can supply 40 houses
-----------1
For d=30 cm Pipe
-------------2
divide 1 & 2
(b)for N=1440 houses
----------------3
Identify the numbers closest to the center between whatever letters you're given, if you're given a number near the center, determine the two letter it it between along the egde of the circle. That's all it is.