Respuesta :
30
You need to make it a porportion 21 over nothing and 70 over 100
then do 21 x 100= 2100 and then you need to divide 2100 by 70
Thats how u get 30
You need to make it a porportion 21 over nothing and 70 over 100
then do 21 x 100= 2100 and then you need to divide 2100 by 70
Thats how u get 30