Znajdź liczbę, której: a) 3 % wynosi 120 b) 23 % wynosi 4,6 c) 250 % wynosi 12 d) 105 % wynosi 21 e) 20 % wynosi 400 f) 35 % wynosi 70 g) 13 % wynosi 52 h) 220 % wynosi 44 i) 71 % wynosi 7,1

a)100%-x 3%-120 3%x= 12000//:3 x=400 b)100%-x 23%-4,6 23%x=460//:23 x=20 c) 100%-x 250%-12 250%x=1200//:250 x=4,8 d) 100%-x 105%-21 105%x=2100//:105 x=20 e) 100%-x 20%-400 20%x= 40000//:20 x=2000 f) 100%-x 35%-70 35%x=7000//:35 x=200 g)100%-x 13%-52 13%x=5200//:13 x=400 h)100%-x 220%-44 220%x=4400//:220 x=20 i)100%-x 71%-7,1 71%x=710//:71 x=10

a) 3% ------ 120 100% --- x x = 100% * 120 / 3% x = 4000 b) 23% --- 4,6 100% --- x x = 100%*4,6/23% x = 20 c) 250% --- 12 100% --- x x = 100%*12/250% x = 4,8 d) 105% --- 21 100% --- x x = 100%*21/105% x = 20 e) 20% --- 400 100% --- x x = 100%*400/20% x = 2000 f) 35% --- 70 100% --- x x = 100%*70/35% x = 200 g) 13% --- 52 100% --- x x = 100%*52/13 x = 400 h) 220% --- 44 100% --- x x = 100%*44/220% x = 20 i) 71% --- 7,1 100% --- x x = 100%*7,1/71% x = 10