Question

a number is first increased by 20 and then the number was decreased by 30% to obtain 105 as a result find the original number​

Answer 1

125 is correct answer

Let the original number be=x

According to question

x×120/100×70/100=105

7x/25=35

7x=35×25

x=(35×25)/7

x=125

Answer 2

Answer:

Step-by-step explanation:

increase by 20% is (100+20) =120/100

decrease by 30% is (100-30)=70/100

obtain result is 105

now,    (120/100) ×(70/100) × X = 105

           (12/10)×(7/10)× X = 105

           (6/5)× (7/10) × X = 105

            X =125