Answer:
Given the statement: One pound of grapes costs $1.55.
Let x be be the cost of 3.5 pounds of grapes.
Equivalent ratios states that the two ratios that express the same relationship between numbers.
Therefore, by equivalent ratio:
then, we have;
Cross multiply the above equation; we hve
x = 5.425
therefore, the cost of 3.5 pounds of grapes is, $5.425