Question

K its midnight and I need HELP!!!! Will fan and medal!

Answer 1

the sum of the digits of a 3-digit number is 21. The sum of the ten's hundreds digits is 3 less than twice the unit's digit. The number is increased by 198 if the digits are reserved. Find the original number

Answer 2

Number xyz
x+y+z=21
x+y=2z-3
xyz=zyx-198
Using the first 2 equations (substitution), you find that z=8.
This means that x+y=13
Using the last equation, after you know that z=8, you can infer that the number must start with a 6 in order to satisfy the increased by 198 rule. Thus, x=6. Plug it in to x+y=13, y=7.
xyz is 678

Answer 3

@ijakez How did you get "6"? That's the only question I have!!

Answer 4

xy8=8yx-198??

Answer 5

because you know z is 8, using the last equation you have xy8=8yx-198 and x+y=13.
You now know that x has to be 6 because 8yx-198 must equal 6y8

Answer 6

@ijakez Thank for this help. Really means a lot to me

Answer 7

Happy to help!