All about
flooble

fun stuff

Get a free chatterbox

Free JavaScript

Avatars
perplexus
dot
info
Home
>
Just Math
Evaluate the missing digit (
Posted on 20180129
)
If the tens digit (second from the right)
of the product p = 2z7 * 39 is 9,
find the digit z.
No Solution Yet
Submitted by
Ady TZIDON
No Rating
Comments: (
Back to comment list
 You must be logged in to post comments.
)
Solution
Comment 1 of 1
2z7 * 39
= 2z7*9 + 2z7*30
The tens digit of the first product is 9z+6
The tens digit of the second product is 1
So the tens digit of p is the unit digit of 9z+7
9z+7 ends in 9
9z ends in 2
9z = 72
z=8
check:
2
8
7*39 = 111
9
3
Posted by
Jer
on 20180129 09:48:02
Please log in:
Login:
Password:
Remember me:
Sign up!

Forgot password
Search:
Search body:
Forums (0)
Newest Problems
Random Problem
FAQ

About This Site
Site Statistics
New Comments (2)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On
Chatterbox:
blackjack
flooble's webmaster puzzle
Copyright © 2002  2018 by
Animus Pactum Consulting
. All rights reserved.
Privacy Information