a:69=804

To solve the equation \( a:69 = 804 \), we can interpret the colon (:) as division. The equation can be rewritten as:

\[ \frac{a}{69} = 804 \]

To isolate \( a \), multiply both sides of the equation by 69:

\[ a = 804 \times 69 \]

Now, we can calculate \( 804 \times 69 \):

\[ 804 \times 69 = 55476 \]

Thus, the value of \( a \) is:

\[ a = 55476 \]