9
Question
A child was born on Friday 1st October in a certain year. His age on Wednesday 1st October 1980 was _______.
A child was born on Friday 1st October in a certain year. His age on Wednesday 1st October 1980 was _______.
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Solution
The correct option is A 4 years
∵∵ 1980 is a leap year
∴∴ Day for 1 Oct. 1979 == Wednesday −2=−2= Monday
Day for 1 Oct. 1978 == Monday −2=−2= Sunday
Day for 1 Oct. 1977 == Sunday −2=−2= Saturday
Day for 1 Oct. 1976 == Saturday −2=−2= Friday
Hence, The age of child on 1 Oct. 1980 =1980−1976=4years.
∵∵ 1980 is a leap year
∴∴ Day for 1 Oct. 1979 == Wednesday −2=−2= Monday
Day for 1 Oct. 1978 == Monday −2=−2= Sunday
Day for 1 Oct. 1977 == Sunday −2=−2= Saturday
Day for 1 Oct. 1976 == Saturday −2=−2= Friday
Hence, The age of child on 1 Oct. 1980 =1980−1976=4years.
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