does anybody know how much a bus ticket from lomdon-stansted to london-gatwick cost???

You are going to do this journey alone? These airports may be have London in their names but they are not that close to London. I hope you are travelling with parents or at least a much older sibling or relative.

OK you will probably need to change in London itself, there is no direct bus service between Gatwick and Stansted as far as I know. As you would both be able to get children's fares it should be cheap.You should be able to get a bus from Stansted to London Victoria and then get a bus from Victoria to Gatwick.

Um, you get a bus to Victoria and then change I believe? Or you can get the train to London Liverpoool Street (£10 for adults), grab the tube to London Bridge and then get the train to Gatwick.

It's £17.00 Return on the train for the bus fare ask at your local bus company

You can get the national express bus. Costs 30pounds for an adult single so I would say maybe about 18pounds or so.

I Think it is about 14.50 each, but it depends on times and days etc. the national express website will be able to give you times and prices plus booking online