A deck is most likely larger than what a yardstick, meter stick, and ruler could measure. A ruler can only measure up to 12 inches, a yardstick can only measure up to 3 feet (or 36 inches), and a meter stick is about the same size as a yardstick. Measuring tape can measure up to 25 feet. 

Most mailboxes will be talker than $\displaystyle 12$ inches and $\displaystyle 3$ feet ($\displaystyle 36$ inches) which would make the mailbox bigger than a ruler, yardstick, and meter stick. However, a mailbox will not be taller than what measuring tape can measure. Measuring tape can measure at about $\displaystyle 25$ feet. 

To find the missing number in the sequence, we need to find the pattern. In this problem, the pattern is adding by fives. So, to find the missing number, we need to add five more to the number before the blank space in the given sequence.

$\displaystyle 15 + 5 = \mathbf{20}$

To find the missing number in the sequence, we need to find the pattern. In this problem, the pattern is multiplying by threes.So, to find the missing number, we need to multiply the number before the blank space by three.

$\displaystyle 9\times 3 = \boldsymbol{\mathbf{}27}$

First, you must notice that the set is counting down/backwards. When you look at how all the numbers are related, you will notice that these numbers decrease by $\displaystyle 11$, or are multiples of $\displaystyle 11$. To solve, you can add $\displaystyle 11$ to the first known number ($\displaystyle 66$) and then $\displaystyle 11$ to that number to find the first number in the sequence.

The complete sequence is:

$\displaystyle 88, 77, 66,55, 44, 33$

To find the next number in the sequence, we need to find the pattern. In this problem, the pattern is multiplying by twos! So, to find the next number, we need to multiply the number before the blank space by two.

$\displaystyle $4\times 2 = 8$

To find the next number in the sequence, we need to find the pattern. In this problem, the pattern is dividing by four! So, to find the next number, we need to divide the number before the blank space by $\displaystyle 4$.

$\displaystyle 8\div4 = 2$

To find the next number in the sequence, we need to find the pattern. In this problem, the pattern is subtracting by fives! So, to find the next number, we need to subtract the number before the blank space by $\displaystyle 5$.

$\displaystyle 27 - 5 = 22$

To find the next number in the sequence, we need to find the pattern. In this problem, we need to multiply by threes! So, to find the next number, we need to multiply the number before the blank space by $\displaystyle 3$.

$\displaystyle $18\times 3 = 54$$

To find the next number in the sequence, we need to find the pattern. In this problem, we need to add by nines! So, to find the next number, we need to add nine to the number before the blank space.

$\displaystyle 18 + 9 = 27$