Sum of 2 digit no is 7.if the digit are reversed the new number so formed increased by 27. find the number

25

Step-by-step explanation:

Sum of digits = 7

Let the digit at unit place be x.

So, digit at tens place = (7-x)          

Original No. = 10(7-x) + x

= 70-10x+x

= 70-9x         (i)

When the digits are reversed,

digit at units place = (7-x)

digit at tens place = x

New No. = 10(x) + (7-x)

= 10x + 7 -x

= 9x +7         (ii)

ATQ,

New Number - Original Number = 27

(9x+7) - (70-9x) = 27

9x+7-70+9x = 27

18x -63 = 27

18x = 27+63

18x = 90

x = 90/18

x = 5

Original Number = 70-9*5 from (i)               New Number = 9*5 + 7 from (ii)

= 70-45                                                                                 = 45+7  

= 25                                                                                       = 52    

Ans = 25  

Check,

New Number - Original Number = 27

52-45=27

L.H.S = R.H.S

25

Step-by-step explanation:

Try 16, 25, 34.

52

Step-by-step explanation:

HOPE IT HELPS YOU ...........

52

Step-by-step explanation:

Let the number is 10a +b

Reversed number = 10b +a

a+b=7

a= 7-b

A/Q

10a+b - (10b +a) = 27

10a + b - 10b -a =27

9a - 9b = 27

9(a-b)=27

a-b=27/9

7 -2b=3

7-3 = 2b

4= 2b

2=b

a=7-b

a=7-2

a=5

The number is 52

52

Step-by-step explanation:

Let the ones digit=x

tens digit=7-x

Number=10*(7-x)+1*x

=70-10x+x

=70-9x

New No.=10*x+1*(7-x)

=10x+7-x

=9x+7

ATQ

9x+7=70-9x-27

9x+9x=43-7

18x=36

x=2

So no. formed= 70-9x

=70-9*2

=70-18

=52

52

Step-by-step explanation:

Let the ones digit=x

tens digit=7-x

Number=10*(7-x)+1*x

=70-10x+x

=70-9x

New No.=10*x+1*(7-x)

=10x+7-x

=9x+7

ATQ

9x+7=70-9x-27

9x+9x=43-7

18x=36

x=2

So no

52

Step-by-step explanation:

Let the ones digit=x

tens digit=7-x

Number=10*(7-x)+1*x

=70-10x+x

=70-9x

New No.=10*x+1*(7-x)

=10x+7-x

=9x+7

ATQ

9x+7=70-9x-27

9x+9x=43-7

18x=36

x=2

So no. formed= 70-9x

=70-9*2

=70-18

=52

=70-9*2

=70-18

=52

Hope it helped u

52

Step-by-step explanation:

let x be tens place and y be units place

x+y=7

x=7-y

10x+y-27=10y+x

put value x =7-y

and the solution is ready

x=5

y=2

answer:

52

Step-by-step explanation:

Let the ones digit=x

tens digit=7-x

Number=10*(7-x)+1*x

=70-10x+x

=70-9x

New No.=10*x+1*(7-x)

=10x+7-x

=9x+7

ATQ

9x+7=70-9x-27

9x+9x=43-7

18x=36

x=2

So no. formed= 70-9x

=70-9*2

=70-18

=52

Number: xy

x + y = 7--> x = 7-y

10y + x = 10 x + y + 27

Simplify:

9y = 9x + 27

9y = 9(7-y) + 27

9y = 63 - 9y + 27

18y =90

y = 5

x = 2

The number is 25

answer:

1-_g=(-1)

2-g=+1

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4-(+4)

5-17 should be added to (-23)

6-divide by 4