The average age of five members in a family is 30 years. If the present age of youngest member in the family is 10 years, what was the average age of the family at the time of birth of the youngest member?
A25
B30
C35
D40
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ഒരു ബാറ്റ്സ്മാൻ 31-ാമത്തെ കളിയിൽ 120 റൺസ് നേടിയപ്പോൾ അയാളുടെ ശരാശരി 3 റൺസ് കൂടിയാൽ പുതിയ ശരാശരി എത്ര?