Question

pls guys solve it's urgent please​

Answer 1

Step-by-step explanation:

let the ten's place digit be x and unit place digit be y

then according to first condition

x + 7 = y........eq. 1 ( x - y = -7)

according to second condition

x+y=xy×1/2.......eq.2

therefore equate both of them to get the answer

Answer 2

Answer:

Let x be the ten's digit of the two-digit number.

Then it's unit's digit =x + 7.

Number = unit's digit + 10(ten's digit )=(x+7)+10(x)= 11x+7.

sum of the digit = (x+7)+(x)=2x+7.

Given, sum of the digit is half of the whole number.

Therefore,

(2x+7)=1/2(11x+7)

4x+14 = 11x+7

4x-11x = 7-14

-7x = -7

x=1

Ten's digit of the two-digit number is x = 1.

Unit's digit of the two-digit number = x+7=1+7=8

Thus, the required. number is 18.

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