The gas meter readings at the beginning and end of a period were: 8247 & 8631, the cost of each unit was 11p, there is also a fixed charge of £25.57, Calculate the cost of the gas. Show your working.

What's for breakfast? all people who ate at a certain restaurant were surveyed as to what they ordered on a particular sunday morning. 40 ate eggs 42 ate sausage 32 ate pancakes 13 ate sausage and eggs 15 ate pancakes and sausage 11 ate eggs and pancakes 6 ate all three items 3 people didn't eat any of the items how many people ate only pancakes? how many people ate at the resturant that morning? how many people didn't eat eggs?