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?
Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):
Showing 1 comment:
The difference of the number is 5 - we calculate difference between digits is 5....
To solve this example are needed these knowledge from mathematics:
Next similar examples:
- 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?
- What is missing (1000)
What number is to add to get 1000?
- Written number
Place+values x ten thousands =30 thousands
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?
- Unknown number xyz
Find the number that its triple is 24. Solve by equation.
123456789 = 100 Use only three plus or minus characters to correct previous identity/equation.
- Roman numerals
Write numbers written in Roman numerals as decimal.
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?
Friday 13th is in 4 days. What day is today and what day it is?
The school attends 344 pupils. Half of them take snacks. 13 pupils who took snacks did not attend school. How many snacks left?
- Mom and dad
Mom wants talk with dad 3.3 hours. But dad wants of 2 times more hours than mom ... How many hours wants dad talk with mom? ...
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?
- 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?
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?
A line of print on a computer contains 64 characters (letters, spacers or other chars). Find how many characters there are in 7 lines.
Jitka read on holidays book that has 180 pages. In the first week read 45 pages. In the second week she read 15 pages more than the first week. How many pages left to read it yet?
There are 28 bunches, and son ate 1/2, dad ate four bunches. How many of them remain on the baking dishes?