Question 1077364
Let:
a=ten's digit
b=one's digit

a+b = 7   (1)
a = 2b+1   (2)

Substitute for 'a' from (2), into (1):   (2b+1)+b = 7
                                       3b+1 = 7
                                        3b = 6
                                          b = 2   —>  a = 2(2) + 1 = 5

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Ans: The number is 52
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