# House numbering

The residential house has three entrances numbered even numbers, successive immediately behind. The sum of the two numbers on the outside entrances is 68. Calculate the middle of these three numbers.

Result

x =  34

#### Solution:

(x-2) + (x+2) = 68

2x = 68

x = 34

Calculated by our simple equation calculator.

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

Be the first to comment!

#### To solve this example are needed these knowledge from mathematics:

Looking for help with calculating arithmetic mean? Looking for a statistical calculator? Do you have a linear equation or system of equations and looking for its solution? Or do you have quadratic equation?

## Next similar examples:

1. Foot in bus
It was 102 people on the bus. 28 girls had two dogs. A 11 girls had one dog. At the next stop seceded 5 dogs (even with their owners). They got two boys together with three dogs. The bus drove one driver. How many foot were in bus?
2. Cages
Honza had three cages (black, silver, gold) and three animals (guinea pig, rat and puppy). There was one animal in each cage. The golden cage stood to the left of the black cage. The silver cage stood on the right of the guinea pig cage. The rat was in the
3. Seven times
Which number seven times is just as higher as 27, how much is smaller than 29?
4. Write decimals
Write in the decimal system the short and advanced form of these numbers: a) four thousand seventy-nine b) five hundred and one thousand six hundred and ten c) nine million twenty-six
5. Roman numerals
Write numbers written in Roman numerals as decimal.
6. Number unknown
Adela thought the two-digit number, she added it to its ten times and got 407. What number does she think?
7. Roman numerals 2+
Add up the number writtens in Roman numerals. Write the results as a roman numbers.
8. 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?
Added together and write as decimal number: LXVII + MLXIV
10. Summand
One of the summands is 145. The second is 10 more. Determine the sum of the summands.