Question

Calvin has been trusted to manage the school candy store, but he is taking advantage of the situation. For every seven pieces of candy that a student buys, Calvin helps himself to three pieces of candy. If Marty buys 42 pieces of candy, how many will Calvin take for himself? Show your work or explain your reasoning.

Answer 1

• 18 pieces

Explanation:

Calvin takes 3 pieces of candy for each 7 pieces sold.

If 42 pieces sold, Calvin takes x pieces.

Use ratios to find the value of x:

• 3/7 = x/42
• x = 3*42/7
• x = 18