Respuesta :
the best way to do this is to set up a proportion
50 x
---- = ----
3 12
then cross multiply and divide ( 50 times 12) / 3= 200
he can do 200 situps in 12 minutes
50 x
---- = ----
3 12
then cross multiply and divide ( 50 times 12) / 3= 200
he can do 200 situps in 12 minutes