Given: Two numbers are respectively 20% and 50% of a third number. Calculations: Let the third number be x. According to the question; First number =(20/100)×x=x/5 Second number =(50/100)×x=x/2 so, Required percentage =
x
5
x
2
×100 ⇒(2/5)×100=40% ∴ The correct answer is 40% Let the third number be 100 First number =20% of 100=20 Second number =50% of 100=50 Required percentage =(20/50)×100% ⇒40% ∴ The required percentage is 40%