Lilly needs at least $400 to buy a phone. Her mom gave her $60 and she earns $10 a day babysitting her little sister. How many days to reach goal? Write and solve the inequality.

Answer 1

Let's say Lilly needs x days to reach her goal.
The amount she earns from babysitting her little sister in x days is 10x.
Adding the $60 her mom gave her, she has: 10x + 60.
The inequality that represents Lilly's situation is: 10x + 60 ≥ 400.
Solving the inequality, we have: 10x ≥ 400 - 60.
Simplifying the right side, we have: 10x ≥ 340.
Dividing both sides of the inequality by 10, we have: x ≥ 34.
Therefore, Lilly needs at least 34 days to reach her goal.