The diagram shows a plan of two adjoining rooms. You are given some of the lengths,

areas and . The value of is the 13th term of the numerical sequence 6, 9, 12, …

and the value of is the sum of five consecutive numbers such that 46 < + < 67.

3.1 Showing all your work and explaining your thinking and reasoning, find the

3.1.1 ℎ term of the sequence 6, 9, 12, … (4)

3.1.2 value of (3)

3.1.3 value of .​