Respuesta :
Step-by-step explanation:
a: 180 because there is only one 10-er number below which is 90 and that is not dividable by 20
b: 20 is the least multiple
Step-by-step explanation:
a: 180 because there is only one 10-er number below which is 90 and that is not dividable by 20
b: 20 is the least multiple