Penelope has 5 M&M candies for every 3 Starbursts candies. If she has 25 M&M candies, how many Starbursts candies does she have?
Let 5 M&amp;M candies and 3 Starbursts candies be referred to as the unit amounts of each candy.
5 M&amp;M candies make one unit so 25 makes 25/5 = 
<gadget id="calculator">25/5</gadget>
<output>5</output>
5 units of M&amp;M candies.
For every unit of 5 M&amp;M candies, there is a corresponding unit of 3 Starbursts candies so for 5 units of M&amp;M, she has 5 units of 3 Starbursts candies which is = 5*3 = 
<gadget id="calculator">5*3</gadget>
<output>15</output>
15 Starbursts candies.

<result>15</result>