Mystery number

A mystery number is between 800 and 920. No digits are the same. The difference of the number is 5. What is the mystery number?

Result

x1 =  803
x2 =  812
x3 =  821
x4 =  830
x5 =  904
x6 =  913

Solution:      Leave us a comment of this math problem and its solution (i.e. if it is still somewhat unclear...):

Showing 1 comment: Dr Math
The difference of the number is 5 - we calculate difference between digits is 5.... Next similar math problems:

1. No. 215 From the number 215 we can create a four-digit number that among its numbers manually type any other digit. Thus, we created two four-digit numbers whose difference is 120. What two four-digit numbers that might be?
2. Number unknown Adela thought the two-digit number, she added it to its ten times and got 407. What number does she think?
3. Written number Place+values x ten thousands =30 thousands
4. Bus On the 4-th stop take on 56 and take off 38 passengers. How many were added (write as positive number) or shrunk (write as negative number) the count of passengers?
5. Unknown number xyz Find the number that its triple is 24. Solve by equation.
6. Three numbers How much we increases the sum of three numbers when the first enlarge by 14, second by 15 and third by 16? Choose any three two-digit numbers and prove results.
7. Roman numerals Write numbers written in Roman numerals as decimal.
8. Fridays Friday 13th is in 4 days. What day is today and what day it is?
9. Mom and dad Mom wants talk with dad 2.2 hours. But dad wants of 2 times more hours than mom ... How many hours wants dad talk with mom? ...
10. Snacks The school attends 344 pupils. Half of them take snacks. 13 pupils who took snacks did not attend school. How many snacks left?
11. Carpenter You want to cut long board into smaller pieces. Carpenter said that one cut of the board into two pieces will cost you 70 cents. But you need to cut the board into 9 parts. How much you pay?
12. Bus 2 On the 6-th stop 44 passengers take off from bus. Overall, the 6-th stop 13 passengers were added. How many passengers take on 6-th stop?
13. Collection Majka gave from her collection of calendars Hanke 15 calendars, Julke 6 calendars and Petke 10 calendars. Still remains 77 calendars. How many calendars had Majka in her collection at the beginning?
14. Postal stamps Jano and Peter exchanged postal stamps. Jano gave Peter 32 stamps of the missile for 8 stamps with turtles. How good was Jano after this exchange (how many he has surplus in exchanged stamps)?
15. Hotel The rooms in the mountain hotel are double and triple. Double rooms are 25 and triple are 17 more. How many rooms are there in this hotel?
16. Computer A line of print on a computer contains 64 characters (letters, spacers or other chars). Find how many characters there are in 7 lines.
17. Baking There are 28 bunches, and son ate 1/2, dad ate four bunches. How many of them remain on the baking dishes?