Homework Help: math

Posted by jazz on Sunday, January 6, 2008 at 11:56pm.

mrs.wheelbarrow weasel is less than 100 years old.her year of birth is divisible by 23 and 17, as well as by one other prime number less than 30.when was mrs.wheelbarrow weasel born?if she was still alive,how old would she be this year?(2007)

math - Reiny, Monday, January 7, 2008 at 12:21am
Since her year of birth must be divisible by both 23 and 17, it must be divisible by 391, (23 x 17)
Since she is less than 100 she must have been born in the 19hundreds.

So her birth year must be a multiple of 361, it is easy to just try a few multipliers by 361 and I got 1955 = 5*391

Notice that 1955 is only divisible by the primes 5,17, and 23

So if she was born in 1955, then in 2007 she would be 52
- math - Reiny, Monday, January 7, 2008 at 12:32am
  "So her birth year must be a multiple of 361, it is easy to just try a few multipliers by 361 and I got 1955 = 5*391 "
  
  should have been:
  
  So her birth year must be a multiple of 391, it is easy to just try a few multipliers by 391 and I got 1955 = 5*391

Answer this Question

Related Questions

MATH - Let’s agree to say that a positive integer is prime-like if it is ...
math - Let’s agree to say that a positive integer is prime-like if it is ...
Maths - Mrs Lim is m years old. She gave birth to her son when she was 20 years ...
math - jackie and janice are sisters with the same birthday, different birth ...
MATH - TWO INTEGERS ARE DEFINED AS "PARTNERS" IF BOTH OF THEIR PRIME ...
health - Children and adolescents are considered to be reflected in which age ...
13 - Children and adolescents are considered to be reflected in which age group...
IB HL Math - I need to that if there is better way to prove the following: I am ...
Math - The question is this: You know that a number is divisible by 6 if it is ...
finance - Mrs. Kay who is 24 years old plans to retire at the age of 60. Mrs. ...

For Further Reading

First Name:
School Subject:
Answer: