There is an unknown number •it is a four digit number •the tens are double the ones •the thousands are double the tens •the sum of the digits of nineteen

8542

Statement

1.It is a four digit number

2.The tens are double the ones

3.The thousands are double the tens

4.The sum of the digits is nineteen

Step-by-step explanation:

It is a four digit number

lets take 4 digit number-ABCD

The tens are double the ones

-----------------------------1

The thousands are double the tens

-------------------------------2

According to equation 1 and 2

If we take

Possible number

OR

The sum of the digits is nineteen

I use hit and trial method

- If I take B is maximum

- If, i try to find value of B

---------------------3

So the unknown number is-  8542

cant open file sorry!

step-by-step explanation:

table 3 represents a direct variation function. : )