It's pretty simple to do.
Boy 4, girl 2, Boy 6, girl 4, Boy 8, girl 6, Boy 10, girl 8, Boy 12, girl 10, Boy 14, girl 12, Boy 16, girl 14, Boy 18, girl 16, Boy 20, girl 18, Boy 22, girl 20, Boy 24, girl 22, Boy 26, girl 24, Boy 28, girl 26, Boy 30, girl 28, Boy 32, girl 30, Boy 34, girl 32, Boy 36, girl 34, Boy 38, girl 36, Boy 40, girl 38, Boy 42, girl 40, Boy 44, girl 42, Boy 46, girl 44, Boy 48, girl 46,
Boy 50, girl 48. Now, we do 48+50=98, or (50+50)-2=98,