[cc100]

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.