z

Young Writers Society


Maths Help Please



User avatar
19 Reviews


Gender: None specified
Points: 1624
Reviews: 19
Fri Mar 04, 2011 4:44 pm
View Likes
Shizzley says...



Ok, so I can't work out the answer to this question for my maths homework and I need some help please! So here it is:

It is £1.50 to park a car in a car park.
This can be paid in £1 coins or 50p coins.

In one day, the car park collected 136 £1 coins and 208 50p coins.

How many drivers paid with three 50p coins?
I'm going to Hagrid's, I've got a good feeling about going to Hagrid's.
  





User avatar
111 Reviews


Gender: Female
Points: 8168
Reviews: 111
Tue Mar 08, 2011 11:37 pm
Kiwisatsuma says...



Well, you know that there are two ways to pay: a £1 coin and a 50p coin, or three 50p coins. Therefore, the people who put £1 coins in must also have put one 50p piece in each, which counts for 136 of the 50p coins.

If you do 208 - 136 you get 72, so you know that there are 72 50p coins which weren't put in by people paying with £1 coins, so they must have been put in by people paying with three 50p coins.

72 divided by 3 is 24, and that's your answer.

Hope this explained it, and that your homework deadline hasn't passed yet. :)
  








This planet has - or rather had - a problem, which was this: most of the people living on it were unhappy for pretty much all of the time. Many solutions were suggested for this problem, but most of these were largely concerned with the movement of small green pieces of paper, which was odd because on the whole it wasn't the small green pieces of paper that were unhappy.
— Douglas Adams, The Hitchhiker's Guide to the Galaxy