Mrs Brambleshaw kept a market stall where she sold apples in three sizes: large apples at £1 each, medium apples at two for £1, and small apples at three for £1. Two medium apples weighed the same as one large apple, and three small apples weighed the same as one large apple.

Mr Barnaby Pickles had a large family. He had the same number of boys as girls, and the youngest children were twin boys. All of children, except the twins, had a birthday in a different month of the year.

He gave his children £7 to spend altogether on apples from Mrs Brambleshaw's stall. If the apples were shared equally by weight among the children, with no apples cut up, how many young Pickles were there?