Ratio of 9m to 27cm
1m = 100cm
So, 9m = 9 x 100cm
= 900cm
now, 900cm/27cm
=300/9
=100cm/3cm
1cm = 1/100 m
so, 27cm = 27/100 m
= .27m
now, 9m/.27m
=3/.9
=1/.3
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