Verified answer

15....20..|..2

15....10..|..2

15....05..|..3

05....05..|..5

01....01

2*2*3*5=60 é o MMC

15,20 | 2

15,10 | 2

15,05 | 3

05,05 | 5

01,01 ____

......... 2*2*3*5=60

mmc(15,20) = 60

15 , 20 | 2

15 , 10 | 2

15 , 5 | 3

5 , 5 | 5

1 , 1

2*2*3*5=60

boa tarde , resposta completa esta nesse link: http://sketchtoy.com/58862147

60

60.