Question

if there is a Saturday on 10th November 2018 then what was the day on 15th August 2017​

Answer 1

Given :-

• there is Saturday on 10th November 2018 .

To Find :-

• what was the day on 15th August 2017 ?

Solution :-

we have to go back from 10th november to 15th august 2017.

So,

Total days are :- (while going back.)

• November = 10 Days. = 3 odd day.
• Oct. = 31 = 3 odd day.
• Sept . = 30 = 2 odd day.
• Aug. = 31 = 3 odd day.
• July = 31 = 3 odd day.
• June = 30 = 2 odd day.
• May = 31 = 3 odd day.
• April = 30 = 2 odd day.
• March = 31 = 3 odd day.
• Feb. = 28 .(since 2018 is not a leap year.) = 0 odd day.
• Jan. = 31 = 3 odd day.
• Dec. 2017 = 31 = 3 odd day.
• Nov. 2017 = 30 = 2 odd day.
• Oct. 2017 = 31 = 3 odd day.
• Sept. 2017 = 30 = 2 odd day.
• Aug. 2017 = 16 Days.(Upto 15 Aug. From Back.) = 2 odd day.

Now,

→ Total odd days are = 3 + 3 + 2 + 3 + 3 + 2 + 3 + 2 + 3 + 0 + 3 + 3 + 2 + 3 + 2 + 2 = 39

Again,

→ Odd days = (39/7) = 4 .

As, we have to go back , Therefore,

→ 15th August 2017 = 10th November 2018 - 4

→ 15th August 2017 = Saturday - 4

→ 15th August 2017 = Tuesday. (Ans.)

Hence, On 15th August 2017 it was Tuesday.

Answer 2

Step-by-step explanation:

10 November 2018 is a Saturday so 10 November 2017 was a Friday (2018 is not a leap year)

16 August 2017 to 10 Nov 2017 = 16 + 30 + 31 + 10 = 87 days i.e. 12 weeks + 3 odd days.

So, 15 August 2017 + 87 days = 10 Nov 2017 = Friday

Friday - 3 days = Tuesday

Hence, the correct answer is Tuesday.