ഒരു ചതുരത്തിന്റെ നീളവും വീതിയും 5 : 4 എന്ന് അനുപാതത്തിലാണ് അതിന്റെ പരപ്പളവ് 320 ചതുരശ്ര മീറ്റർ എന്നാൽ വീതി എത്ര ?
A16
B20
C24
D28
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