Two men

JamesScott

Posers and Puzzles

29 Sep 05

JamesScott

Joined: 25 Sep 05
Moves: 52

29 Sep 05

There are two men, John & Peter. John is 2x as old as Peter was when Peter was 2x as old as John. When you add their ages together you get 72.

How old are they?

c1arinetboy

Phoenix, AZ

Joined: 24 Sep 05
Moves: 379

29 Sep 05

Originally posted by JamesScott
There are two men, John & Peter. John is 2x as old as Peter was when Peter was 2x as old as John. When you add their ages together you get 72.

How old are they?

Let the younger age of John be x

2(2x) + (2(2x) + x) = 72
9x = 72
x = 8

John is 32 and Peter is 40

c1arinetboy

Phoenix, AZ

Joined: 24 Sep 05
Moves: 379

29 Sep 05

I've been doing problems like these in school recently. Here's one:

A purse containing $4.80 in quarters and dimes has, in all, 30 coins. How many of each coin was there?

XanthosNZ

Cancerous Bus Crash

p^2.sin(phi)

Joined: 06 Sep 04
Moves: 25076

29 Sep 05

Originally posted by c1arinetboy
I've been doing problems like these in school recently. Here's one:

A purse containing $4.80 in quarters and dimes has, in all, 30 coins. How many of each coin was there?

x*0.25 + y*0.1 = 4.8
x + y = 30

I leave the rest as an exercise for the reader.

(Lol DeBranges)