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On a set of house plans, the scale is 2 cm : 5 m. If the actual length of a room is 18 m, what is the length of the room on the plans?

a.2.5
b.3.6
c.7.2
d.9

Answer :

mumsy
if 
2cm...................................5 m
?cm....................................18 m
the lenght of the room= (18*2)/5=7.20 cm
choice c

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