For every 8 girl campers, there are 7 boy campers. So 8+7 is 15. Therefore, if there were 15 campers, 8 would be girls and 7 would be boys. But there are 195 campers. 15 goes into 195, 13 times. So there are 8x13 girl campers and 7x13 boy campers.
Girl campers: 104
Boy campers: 91