Question

In a two digit number, the digit at tens place is 7 and the sum of the digits is 8 times the digit at unit place. Then the number is .....,select a proper option (a), (b), (c) or (d) from given options so that the statement becomes correct..
(a) 70
(b) 71
(c) 17
(d) 78

Answer 1

(b)71 is the correct answer.

Answer 2

Option ( b ) is correct.

Explanation :

Ten's place digit = 7 ( given )

Let unit place digit = x

The number = 70 + x ---( 1 )

According to the problem given ,

Sum of the digits = 8 times of x

=> 7 + x = 8x

=> 7 = 8x - x

=> 7 = 7x

=> 7/7 = x

=> 1 = x

x = 1

put x = 1 in ( 1 ) , we get

The number = 70 + 1

= 71

Therefore ,

Required two digit number = 71

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