Respuesta :
6 cannot go into 21 evenly
6x3=18
6x4=24
5 cannot go into 21 evenly
5x4=20
5x5=25
4 cannoth go into 21 evenly
4x5=20
4x6=24
3 can go into 21 evenly
3x7=21
6x3=18
6x4=24
5 cannot go into 21 evenly
5x4=20
5x5=25
4 cannoth go into 21 evenly
4x5=20
4x6=24
3 can go into 21 evenly
3x7=21