Final answer:
By setting up a proportion based on the given ratio of vanilla to chocolate ice cream cones (5:8) and the number of chocolate cones sold (40), we calculate that 25 vanilla cones were sold.
Step-by-step explanation:
To determine how many vanilla ice cream cones were sold based on the ratio and the number of chocolate cones sold, we can set up a proportion. The ratio of vanilla ice cream cones to chocolate ice cream cones is given as 5:8. This means for every 5 vanilla cones sold, there are 8 chocolate cones sold. Since we know that 40 chocolate cones were sold, we can set up the proportion as follows:
5/8 = x/40
Now, cross-multiply to solve for x, which represents the number of vanilla cones:
5 × 40 = 8 × x
200 = 8x
Divide both sides by 8 to isolate x:
200 / 8 = 8x / 8
25 = x
Therefore, 25 vanilla cones were sold when 40 chocolate cones were sold.
The correct answer is A. 25 vanilla cones were sold.