h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

I went on holiday to America and was persuaded to partake of a local food treat Pizza... At the restaurant, the 10" pizza sells for $4.99, the restaurant claimed they have a great deal on the large 14" pizza, which is specially priced at $7.34. I still can't work out how much cheaper the bigger pizza was, can you help?

What is the per cent discount the restaurant was offering?

25%

25% discount

HP
»--.

Yep - 25% - swine

Assuming you work on a 'price per square inch' basis (and that my maths isn't hopelessly inadequate )

Incredible - a simulpost after exactly 7 minutes!

Even more incredible, I am never the first in a simpost list.
Well done, , Danny.

HP
»--.

OK... I can do that...

The area of a circle is 1/2 * Pi * r^2 = 1/8 * Pi * d^2. This means that the pizza with a diameter of 10" has a price of 0.124 $/square inch, whilst the 14" pizza has a price of 0.0931 $/square inch to 3 significant digits.

Thus, if you choose the big pizza, you pay 0.0931/0.124 * 100 = 0.751 to 3 significant digits, and the discount is almost 25%.

I'm sure I got something wrong... What do you think??

Hey!!! There was no one there when I started writing... I spend a little while explaining how I get the result... and there are 6 posts before me??????

Oh, well in that case I would never have got it! My defective maths brain remembered the formula for the area of a circle as being pi*(r*r), not 1/2*pi*(r*r).

Oh well,

Congrats for just getting it!

The formula for the area of a circle is pi.r^2 isn't it It doesn't make any difference to the maths for this question though...

Well that is ok then - my brain isn't as defective as I thought, but Paul's is

How on *earth* did I get to think that it was 1/2 * pi * r^2????

Ahh well.. I told you I'd done something wrong..

Never mind, you got the right answer!

In fact your answer might even be the closest as you went to a decimal place with it

Thanks.. What makes this even more worrying though is that I'll study for a degree that's 50% maths...

Anyway... I doubt I'll get the point, Danny B was first (how can he always be first??? )

He isn't always

But the real question is how many could Greebo purchase from her savings.

Well done Danny... a point to you... ~grin~...

It isn't cheaper. It's dearer. But I'm a day late. And who said the pizzas were round.

*wanders off mumbling about always being late for the quiz*