15%x=3 15/100x=3 x=3*100/15 x=20 ---------------- 20% x=4 1/5 x=4 x=485 x=20 ------------- 30%x=15 3/10x =15 x=15*10/3 x=50 ----------------------- 40% x=8 4/10 x=8 2/5 x=8 x=8*5/2 x=20 ------------------- 6%*2 =6*2/100 =12/100 =0,12 ----------------------- 10%*24 =10*24/100 =24/10 =2/4 ----------------------- 15%*60 =15*60/100 =9 ------------------- 30%*1200 =30*1200/100 =30*12 =360
Jaka to liczba której 1. 15% wynosi 3 15% = 3 100% = x x = 100 * 3 /15 x = 300/15 x = 20 20 % wynosi 4 20% = 4 100% = x x = 100 * 4 / 20 x = 400/20 x = 20 30% wynosi 15 30% = 15 100% = x x = 100 * 15 /30 x = 1500/30 x = 50 40% wynosi 8 40% = 8 100% = x x = 100 * 8 /40 x = 800/40 x = 20 2. 6% z liczby 2 2 * 6% = 2 * 0,06 = 0,12 10% z 24 24 * 10% = 24 * 0,1 = 2,4 15% z 60 60 * 15% = 60 * 0,15 = 9 30% z 1200 1200 * 30% = 1200 * 0,3 = 360 Pozdrawiam
