# 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 example 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 examples:

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. I think
I think a number. When I multiply it by five, and after that I subtract 477, I get the same number as if I multiplied it twice. What number do I 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. 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.
6. Roman numerals
Write numbers written in Roman numerals as decimal.
7. Fridays
Friday 13th is in 4 days. What day is today and what day it is?
8. Fedor
Fedor stood in the small pool. Above the surface was a part of his body that was twice as long as part of his body underwater. What height does Fedor have, if his body part below the surface is 5 dm long?
9. Snacks
The school attends 344 pupils. Half of them take snacks. 13 pupils who took snacks did not attend school. How many snacks left?
Mom wants talk with dad 3 hours. But dad wants of 2 times more hours than mom ... How many hours wants dad talk with mom? ...
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 100 cents. But you need to cut the board into 9 parts. How much you pay?
12. School marks
Boris has a total of 22 marks. Ones have 3 times less than threes. There are two twos. How many has ones and threes?
13. Tulips and daffodils
Farm cultivated tulips and 211 units on 50 units more daffodils. How many spring flowers grown together?
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. 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.
16. 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?
17. 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?