Find the value of each variable.

Match each story to an equation and its solution.

Stories:

1. The temperature is \(\text-7\). Since midnight the temperature tripled and then rose 5 degrees. What was the temperature at midnight?
2. Jada has 7 pink roses and some white roses. She gives all of them away: 5 roses to each of her 3 favorite teachers. How many white roses did she give away?
3. A musical instrument company reduced the time it takes for a worker to build a guitar. Before the reduction it took 5 hours. Now they can build 3 guitars in 7 hours. By how much did they reduce the time it takes to build each guitar?
4. A club puts its members into 5 groups for an activity. After 7 students have to leave early, there are only 3 students left to finish the activity. How many students were in each group?

A baby giraffe weighed 132 pounds at birth. He gained weight at a steady rate for the first 7 months until his weight reached 538 pounds. How much did he gain each month?

Six teams are out on the fields practicing soccer. The teams all have the same number of players. A coach asks 2 players from each team to help move some equipment. Now there are 78 players on the fields. Write and solve an equation whose solution is the number of players on each team.

A small town had a population of 960 people last year. The population grew to 1200 people this year. By what percentage did the population grow?

Double number line, top line number of people, evenly spaced tick marks labeled 0, 120, 240, 360, 480, 600, 720, 840, 960, 1080, 1200. Bottom line, corresponding tick marks, first labeled 0% and the rest blank.

The gas tank of a truck holds 30 gallons. The gas tank of a passenger car holds 50% less. How many gallons does the tank of the passenger car hold?