an easy way to do it is to first draw two and a half circles,(circles represent 20s)then first divide the two full circles(not including the half circle).So now we have two 20s.You should know that 10 divided by 2 equals 5 so divide that ten and there you go you have 25 for your answer!
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50
You get 20.
Divide the 20 over 50 by 10
Any of them. To get 50 to 30 you could... subtract 20 add -20 divide by 5/3 multiply by 3/5
40% you do a proportion 20 x ---- = ----- 50 100 then cross multiply to get 50x=2000 and divide each side by 50 to get 40%