Number of salads sold is 115
<em><u>Solution:</u></em>
Let "s" be the number of salads sold
Let "d" be the number of drinks sold
Cost of 1 salad = $ 6.50
Cost of 1 drink = $ 2.00
<em><u>The food trucks revenue from selling a total of 209 salads and drinks in one day was $936.50</u></em>
number of salads sold + number of drinks sold = 209
s + d = 209 ------ eqn 1
The total revenue was $ 936.50
We can frame a equation as:
number of salads sold x Cost of 1 salad + number of drinks sold x Cost of 1 drink = 936.50
6.5s + 2d = 936.50 ----- eqn 2
<em><u>Let us solve eqn 1 and eqn 2 to find values of "s" and "d"</u></em>
From eqn 1,
s = 209 - d ---- eqn 3
Substitute eqn 3 in eqn 2
6.5(209 - d) + 2d = 936.50
1358.5 - 6.5d + 2d = 936.50
-4.5d = -422
Substitute d = 93.78 in eqn 3
s = 209 - 93.78
Thus 115 salads were sold