Question

please answer fast in the above image

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Answer 1

let the no. be (ab), i.e.=10a+b

a+b=9 ...(1.)

and,

7(10a+b)=4(10b+a)

70a+7b=40b+4a

66a=33b

2a=b ...(2.)

put (2) in (1),

3a=9

a=3

from (2)

b= 6

so, no. is 36

Answer 2

please see the attached photo for your answer