A wallet containing £40 has three times as many $1 notes as 5 notes. Find the number of each kind?

Question

hoblos · Answer

the first is in  £   and the others are in $
do you know how to convert??

anonymous · Answer

no that is a typo. the currency is all the same.

cwrw238 · Answer

oh - thats why i got confused!!

hoblos · Answer

0k 
let x=number of $1 notes
     y=number of $5 notes

x+5y =40
x=3y -------> replace this in the first equation

3y+5y=40
   y=5

x=3y=15

hoblos · Answer

number of $1 notes is 15
number of $5 notes is 5

anonymous · Answer

how did you come up with those systems?

hoblos · Answer

"three times as many $1 notes as 5 notes" means s=3y this is obvious

"wallet containing $40" means that the sum of all the money is $40
so x*($1) + y*($5) =$40

anonymous · Answer

are you a genius???

hoblos · Answer

no not really :P

anonymous · Answer

one last thing, I thught because  there were 3 times more £1 notes "x" then £5 notes "y" that 3x=y.

hoblos · Answer

what i understand from this is that x=3y !!
well you better ask somebody else about to make sure

anonymous · Answer

but how does that show that there are 3 times more x's then y's?