7.A conference hall is 14 m long, 8 m wide and 4 mhigh. There are four windows and one door in it. Thedoor measures 1 m by 2 m and each windowmeasures 1 m by 1.5 m.(i) How many litres are needed to paint all thewalls of the hall if one litre is enough forcovering 18 m2?(i) What will be the cost of painting the hall if1litre costs 225?

7.A conference hall is 14 m long, 8 m wide and 4 mhigh. There are four

1.	7.A conference hall is 14 m long, 8 m wide and 4 mhigh. There are four windows and one door in it. Thedoor measures 1 m by 2 m and each windowmeasures 1 m by 1.5 m.(i) How many litres are needed to paint all thewalls of the hall if one litre is enough forcovering 18 m2?(i) What will be the cost of painting the hall if1litre costs 225?
Answer» L=14B=8H=4Lsa=2 (l+b)×H =2 (22)×4=176door=1×28=284 windows=4×1×1.5=6So the area to be painted =176-(6+28)=176-34=142 m^2Litres required=142/18Cost=142/18×225=1775