Question

On 15 May 2006 Chandran went to a shop to buy butter. He checked the packet to see if this butter was safe to eat.
It was written on the packet — Best before 180 days from the date of packing.
Then he checked the date of packing. It was 15/01/06.
Help him find out if he should buy this butter or not.
— In which month was the butter packed? ______
— Which month will it be 180 days after 15/01/06? _____
— Can Chandran eat it one 15^th May 2006? _____

Answer 1

— Butter was packed on 15/01/06, so the month of packing is January.
— It was best to use the butter before 180 days from the date of packing.
Let's calculate 180 days from the date of packing.
Days in January = 17
Days in February = 28
Days in March = 31
Days in April = 30
Days in May = 31
Days in June = 30
Days calculated so far = 17 + 28 + 31 + 30 + 31 + 30 = 167
Remaining days = 180 − 167 = 13
There will be 13 days in July. So, the date is 13 July 2006.
— As it is safe to use the butter till 13 July 2006, Chandran can eat it on 15 May 2006.