Question

answer marked one please fast
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Answer 1

Step-by-step explanation:

13.

let the two digit number be 10x+y

since , x+y= 7

x=7-y .....(I)

interchanging the digit , the no. = 10y+x

A/c to ques ,

10y+x = 10x+ y-9

10y+7-y = 10(7-y) +y-9 .... from (i)

9y+7=70-10y+y-9

18y = 54

y=3

x=7-3=4

therefore , the no is 43

Answer 2

Answer:

question 13 ans is 3,4

question 15 ans is 7,2

Step-by-step explanation:

3+4=7

43-34=9

7+2=9

72-27=45