Lucy was born on Wednesday, December 1st, 2004. That Wednesday was the first day of her life. Her parents held a party for her on the $1000$th day of her life. On which day of the week was the party?

Swim2433 Jul 25, 2020

#4**0 **

**Mr. BB,** You forgot the sage advice I’ve offered to you many times: **You have to be smarter than the machine** you are using. The machine gave you an answer and you believe it –it must be true!

The machine is correct, so it is *smart*. **The information you gave to the machine is not correct, so you are not smarter than the machine**.

**The question clearly indicates. That Wednesday, December 1st, 2004 was the first day of Lucy’s life. So … adding a thousand days to this would give the 1001 ^{st} day. **

This type of question is normally solved using modulo arithmetic: 999 mod 7 = 5. If Wednesday is the first day then Monday is the fifth day.

I bet you are wondering why it’s 999 mod 7 instead of 1000 mod 7. I can answer your question, but I’ll let you figure it out –you really need the practice!

.

Guest Jul 25, 2020

#5**+1 **

2004 was a leap year

1000 days later will not hit another leap year (which come every 4th year)

day 1 was a Wednesday ... 999 days later would be 142.71 weeks

day 1 8 15 22 are all wednesdays

day 1 + 142*7 = 995 is a wednesday 999 would be a Sunday , I believe

ElectricPavlov Jul 25, 2020

#6**+1 **

**Leap year days are irrelevant here. **

The question asks on what day of the week the celebration will occur after 1000 elapsed days, where first day is the day of her birth. **If she was born on a Wednesday then the celebration will occur on a Monday, no matter what year or date she was born. **

Guest Jul 25, 2020

#8**+1 **

Yep...... You are correct ....(at least I found the same answer) 1 day later would be thursday day two of her life

7days later would be wdnesday again day 8 of her life

994 days later would be a wednesday day 995 of her life

995 days later = thursday day 996 of her life

996= friday

997 = sat

998 = sunday

999 = MONDAY day 1000 of her life

**THANX , Guest ! **

ElectricPavlov
Jul 25, 2020