Peter notices that the teenage students who are members of the math club have ages whose product is 611520. How many members does the club have?

Extensions: Is it true that whatever number replaces 611520 that this problem has a unique solution? Suppose the club included 12 year olds and the product was
163762560, how many members does the club now have

3 answers

I tried dividing the given number by number that reflect teenagers.
That is, I started with 13
61150 = 13*47040
47040 = 14*3360
3360=15*224
224=14*16

so the factors are:
13*14*14*15*16
So there are 5 factors, thus 5 members in the club

For the second part, start with 12, then use my method
(hint your number divides by 12 evenly three times)
If you have 12 year olds, you can switch around 12, 16, and 18 year olds. There isn't always a unique solution for if 12 is included.
c) 163 762 560= 2^7*3^9*5*13
1-13 yr-old
2-12 yr-old
3-18 yr-old
1-15 yr-old
=7 members