[tex]Ratio\ of\ the\ number\ of\ boy\ to\ number\ of\ girls:\\
8:7\\\\
All\ campers:\ 195\\\\
Number\ of\ boys:\\
8x\\
Number\ of\ girls\ :\\
7x\\\\
8x+7x=195\\
15x=195\ \ \ |:15\\
x=13\\\\
Boys:\ \ 8x=8*13=104\\
Girls:\ \ 7x=7*13=91\\\\
Number\ of\ boys\ is\ 104\ and\ girls\ 91.[/tex]