Question

i am a two digit number above 50. the sum of my digits is 12. and the difference of my digits is 4. who am i?

Answer 1

let the tens digit be x
let the unit digit be y

x+y = 12
x-y = 4
add them
2x = 16
x = 8
y = 4

the number is 84

Since the choices were quite limited, (x = 5,6,7,8,or9 )
it would have been just as fast to "guess" at the solution

Answer 2

84

Answer 3

Let both the numbers be 10x and y
As the question says
x+y=12
x-y=4
Now add both 12 and 4 (12+4=16)
2x=16 (divide: 16÷2=8)
x=8

Now subtract: (16-8=4)
y=4
Therefore 10x and y = (10*8=80) 80+4=84

Now to check the answer:
8+4=12
8-4=4
It is above 50

So the answer is correct

Answer 4

84