Two men

Two men

Posers and Puzzles

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J
Standard memberJamesScott

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?

c
Standard memberc1arinetboy

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

c
Standard memberc1arinetboy

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?

X
Standard memberXanthosNZ
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)