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Krishna Kumar S

· started a discussion

· 1 Months ago

Doubt (Question: 368310.0 )

Please explain the second step little further

How u tuk
10x + (7-x+1) ??

Question:

The sum of the digits of a two digit number is 7. The unit digit of the number is equal to the tens digit of the number obtained when it is halved. Tens digit of the number is 1 less than units digit of the number obtained when its halved. What is original number? 

Options:
A)

43

B)

52

C)

61

D)

Data are insufficient

Solution:

Ans:(b) 

  

Knowledge Expert

· commented

· 1 Months ago

Dear student
According to Question
Two digit no. = 10(7-x) + x
Other no. = 10x +( (7-x)+1)

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