Question

Lisa needs 125 pieces of candy for her guests at a party she is hosting. The candies come in packages of 35. She already has 20 pieces of candy left over from a previous party. How many packages of candy will Lisa have to buy to have 125 pieces of candy exactly? Create a two-step equation that models this problem and select which of the values below satisfies that equation.

Answer 1

Lisa needs 125 pieces of candy. She already has 20 pieces of candy, and they come in packages of 35. So, the 20 pieces of candy Lisa already has plus however many bags of 35 candies she needs should equal 125 pieces of candy.

You get this equation:
20 + 35x = 125, where x is the number of candy bags she needs

Solve the equation for x:
20 + 35x = 125 | Subtract 20 from both sides
35x = 105 | Divide each side by 35
x = 3

Lisa needs to by 3 candy bags