  ### Home > CCA > Chapter 7 > Lesson 7.1.4 > Problem7-49

7-49. This problem is a checkpoint for solving problems by writing equations. It will be referred to as Checkpoint 7A.

For each problem, write one or two equations to represent the situation and then solve. Be sure to define your variable(s) and clearly answer the question. Homework Help ✎

1. The Lee’s have three children. The oldest is twice as old as the youngest. The middle child is five years older than the youngest. If the sum of the ages is $57$, how old is each child?

2. In Katy’s garden there are $105$ ladybugs. They are increasing at two ladybugs per month. There are currently $175$ aphids and the number of aphids is decreasing at three aphids per month. When will the number of ladybugs and aphids in Katy’s garden be the same?

3. At the farmer’s market Laura bought three pounds of heirloom tomatoes. If the tomatoes are priced at $8$ for five pounds, what did Laura pay for her tomatoes?

4. Adult tickets for the school play cost $5$ and student tickets cost $3$. Thirty more student tickets were sold than adult tickets. If $1770$ was collected, how many of each type of ticket was sold?