Răspuns :
( x : 100 ) ori 40 = 20
( 40x : 100 ) = 20
40x = 20 ori 100
40x =2000
x = 2000 : 40
x = 200:4
x = 50
( 40x : 100 ) = 20
40x = 20 ori 100
40x =2000
x = 2000 : 40
x = 200:4
x = 50