Asked by Edward



It is a 4-digit number

The tens are double the ones.

The thousands are double the tens.

The sum of the digits is 19.

What number is it?

Answers

Answered by Reiny
ones digit --- x
tens digit ---- 2x
thousands --- 4x
hundreds -----y

x+2x + 4x + y = 19
y = 19-7x

but x and y must be single digit positive integers.
let x = 1, then y = 12 , not possible
let x = 2, then y = 5
The number is 8542

let x = 3, then y = 19-21 = negative, no good
any higher number of x will make things even worse

so the number is 8542
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