Instructions for a craft project say that the length of the red ribbon should be 7 inches less than the length of the blue ribbon.

1. How long is the red ribbon if the length of the blue ribbon is:

   10 inches?

   27 inches?

   \(x\) inches?

2. How long is the blue ribbon if the red ribbon is 12 inches?

Tyler has 3 times as many pens as Mai does.

1. How many pens does Mai have if Tyler has:

   15 pens?

   21 pens?

   \(x\) pens?

2. Tyler has 18 pens. How many pens does Mai have?

A bottle holds 24 ounces of water. It has \(x\) ounces of water in it.

1. What does \(24-x\) represent in this situation?
2. Write a question about this situation that has \(24-x\) for the answer.

Write an equation represented by this tape diagram using each of these operations.

1. addition
2. subtraction
3. multiplication
4. division

Select all the equations that describe each situation and then find the solution.

1. Han's house is 450 meters from school. Lin lives 135 meters closer to school than Han does. What is the distance of Lin’s house from school, \(z\)?

   • \(z = 450 + 135\)
   • \(z = 450-135\)
   • \(z-135 = 450\)
   • \(z + 135 = 450\)

2. Tyler's playlist has 36 songs. Noah’s playlist has one quarter as many songs as Tyler's playlist. How many songs are on Noah’s playlist, \(w\)?

   • \(w = 4 \boldcdot 36\)
   • \(w = 36 \div 4\)
   • \(4w = 36\)
   • \(\frac{w}{4} = 36\)

You had $30. You spent 70% of the money on books. How much money did you spend on books?

A trash bin has a capacity of 50 gallons. What percentage of its capacity is each amount? Show your reasoning.

1. 5 gallons
2. 30 gallons
3. 45 gallons
4. 100 gallons