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## Answers

Let the no. be x.

35% of a no.=

Then x -

20

x =

13

x=60

35% of a no.=

__35x__+ 39 = x__100__

Then x -

__7x__= 3920

x =

__20×39__13

x=60

35% of that number added to 39 is the number itself = 35x/100 + 39 = x

⇒7x/20 + 39 = x

⇒x - 7x/20 = 39

⇒(20x-7x)/20 = 39

⇒13x/20 = 39

⇒ 13x = 39×20

⇒ 13x = 780

⇒ x = 780/13

⇒ x = 60.

Check : 35x/100+39=x

⇒35(60)/100+39 = 60

⇒2100/100+39 = 60

⇒ 21+39 = 60

⇒ 60 = 60

Therefore , L.H.S = R.H.S .