Respuesta :

Lohrom
sounds to me like it would be 27.7 the way you have it worded
30 tens = 29 tens and 10 ones = 29 tens 9 ones and 10 tenths

so 30 tens - 3 tens 3 tenths = 
29 tens 9 ones and 10 tenths - 3 tens 3 tenths
=26 tens 9 ones and 7 tenths