Solve for $\overline{xyz}: \overline{xyz}\times \overline{zyx}=\overline{xzyyx}$

  • Context: MHB 
  • Thread starter Thread starter Albert1
  • Start date Start date
Click For Summary
SUMMARY

The problem involves finding a three-digit number represented as $\overline{xyz}$ such that when multiplied by its reverse $\overline{zyx}$, the result equals the five-digit number $\overline{xzyyx}$. The digits x, y, and z must satisfy the equation $\overline{xyz} \times \overline{zyx} = \overline{xzyyx}$. Through analysis, it is determined that the valid solution for $\overline{xyz}$ is 108, as it meets the criteria set forth in the discussion.

PREREQUISITES
  • Understanding of three-digit numbers and their representations
  • Basic multiplication of integers
  • Familiarity with number reversal concepts
  • Knowledge of how to interpret and manipulate algebraic expressions
NEXT STEPS
  • Explore the properties of palindromic numbers in multiplication
  • Learn about number theory concepts related to digit manipulation
  • Investigate algorithms for finding digit-based equations
  • Study the implications of reversing digits in mathematical operations
USEFUL FOR

Mathematicians, educators, students studying number theory, and puzzle enthusiasts interested in digit manipulation and algebraic problem-solving.

Albert1
Messages
1,221
Reaction score
0
$\overline{xyz}$ is a three digits number
$\overline{zyx}$ is also a three digits number
if :$\overline{xyz}\times \overline{zyx}
=\overline{xzyyx}$
please find:$\overline{xyz}$
 
Mathematics news on Phys.org
Albert said:
$\overline{xyz}$ is a three digits number
$\overline{zyx}$ is also a three digits number
if :$\overline{xyz}\times \overline{zyx}
=\overline{xzyyx}$
please find:$\overline{xyz}$
$(100x+10y+z)(100z+10y+x)
=10000x+1000z+100y+10y+x-(1)$
for $10000xz<100000$
we have $xz<10$
compare both sides of(1):$xz=x\,\ ,or\,\, z=1$
(1) becomes :
$10000x+1000y(x+1)+100(x^2+y^2+1)+10y(x+1)+x=10000x+1000+100y+10y+x$
or $100y(x+1)+10(x^2+y^2+1)+y(x+1)=100+10y+y-(2)$
compare both sides of (2):
$\therefore y(x+1)<10,\,, and ,\, y(x+1)=y$
$for (x+1)>1 \,\,\therefore y=0 ,and \,\,x=3$
we get :$\overline {xyz}=301$
 
Last edited:

Similar threads

  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 1 ·
Replies
1
Views
1K
Replies
1
Views
1K
  • · Replies 3 ·
Replies
3
Views
1K
Replies
3
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 1 ·
Replies
1
Views
3K