BB FANS

Can you solve this teaser thats been bugging me?

"A friend has sent you the recipe for oat biscuits:

2oz(ounce) flour
2oz butter
7oz roled oats
3oz sugar

Using the info below, calculate the expected amount of fat in 100 grams of finished oat biscuits.

1oz = 28.35 grams

100 grams of butter contains 90gram of fat.

There is no significant amount of fat in flour, sugar or rolled oats."

Now thats a toughie.

I THINK...

In 14oz of the finished product, there will be 56.7g of butter, so 51.0g of fat.

14oz = 396.9g

So, approximately, in 400g of finished product there will be 52g of fat.

I think, then, in 100g of finished product there will be about 13g of fat.

I THINK!

Your on the right lines Cam, close but no cigar.

I have the answer here, but Ill let others have a pop first.

I'd have thought 12.8g ,but then I wondered about evaporation of part of the butter which I'd guess would mean a higher fat content ?

doesn't the sugar convert into fat? or is that after you've eat it?

You don't need to calculate between ounces and grams, you just need the percentage. e.g. the butter makes up 1/7 of the ingredients and 90% of it is fat.

So the simplest way is: 100 / 7 x .9 = 12.857142%.

Which gives you 12.857142 grams.

Do I get a gold star?

is this not a trick question? Where's all the maths boffins when you need them?

How do you know I'm not one?

I'm thinking that is MUST be in the 12.8-13g region. I think there's a flaw in the original.

You mean in the original question? It's slightly unclear - it doesn't say what measurement to use - it just says "expected amount" so you could answer as a percentage and still be right.

The correct answer is 12.86g per 100g.

Thanks for all your hard work.

- no problem, glad we could help.