Răspuns :
( d + 50 ) × 4 = 240
( d + 50 ) = 240 : 4
d + 50 = 60
d = 60 - 50
d = 10
( e - 300 ) × 6 = 102
( e - 300 ) = 102 : 6
e - 300 = 17
e = 300 + 17
e = 317
( d + 50 ) = 240 : 4
d + 50 = 60
d = 60 - 50
d = 10
( e - 300 ) × 6 = 102
( e - 300 ) = 102 : 6
e - 300 = 17
e = 300 + 17
e = 317