Question

plz help me out
helpless


























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Answer 1

let the digits be x and according to the given question 10x+y= 7(x+y) ,7x+7y=10x+y ,3x=6y. x=2y. by the question we also know that 10y+x+18=10x+y. by keeping the value of x=2y you get 12y+18=21y and 9y=18. and y=2 and x=4