Question

ix) In a 2-digit number, the face value of the digit
in the tens place is double the face value of the
digit in the ones place. If the sum of the two face
values is 12, find the 2-digit number.
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Answer 1

Answer:

84

Step-by-step explanation:

let the number be x y

y=2x

2x + x = 12

x = 4

therefore 2X = 8

thus the number is 84

Answer 2

Answer:84

Step-by-step explanation:

Let the 2 digit number be xy where x is at 10's place & y at unit place.

By question,

x=2y...............(1)

x+y=12............(2)

2y+y=12

Or 3y=12

Or, y=4

Now x=2y =2×4=8

Hence required number is (xy)=(84)