You are Here: Home >< Maths

# maths question

Announcements Posted on
Four hours left to win £100 of Amazon vouchers!! Don't miss out! Take our short survey to enter 24-10-2016
1. my four grandchildren are called ben, maria, adam, tara.. their birthdays are on the 128th, 182nd, 218th and 281st days of the year respectively (except leap years) which 2 of my grandchild have their birthday on the same days of the week every year (expect leap years). the answer is adam and tara ..can some please explain why and how? im gonna go crazy
2. (Original post by sammyj97)
my four grandchildren are called ben, maria, adam, tara.. their birthdays are on the 128th, 182nd, 218th and 281st days of the year respectively (except leap years) which 2 of my grandchild have their birthday on the same days of the week every year (expect leap years). the answer is adam and tara ..can some please explain why and how? im gonna go crazy
This is to do with modulus (The amount left after you divide by a number).
-The week consist of 7 days
-try all 4 numbers modulus 7:
128 mod 7 = 2
182 mod 7 = 0
218 mod 7 = 1
281 mod 7 = 1

as mod 7 of 218 and 281 is the same it mean they are on the same day of the week therefore Adam and Tara is the answer

Im not sure how clear my explanation is, if u didnt understand it please let me know
3. (Original post by dragozox)
This is to do with modulus (The amount left after you divide by a number).
-The week consist of 7 days
-try all 4 numbers modulus 7:
128 mod 7 = 2
182 mod 7 = 0
218 mod 7 = 1
281 mod 7 = 1

as mod 7 of 218 and 281 is the same it mean they are on the same day of the week therefore Adam and Tara is the answer

Im not sure how clear my explanation is, if u didnt understand it please let me know
I got it thank you, It was a non calc question so i didn't think to divide since i knew the answers were going to be endless decimals.. I need to revisit some topics lol

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: August 14, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### Who is getting a uni offer this half term?

Find out which unis are hot off the mark here

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read here first

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams