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 the goal? Write and solve the inequality.

Answer 1

Let d be the number of days Lilly babysits.
The total amount she earns from babysitting is $10 * d.
In total, she earns $10 * d + $60.
This is equal to or greater than $400, so:
$10 * d + $60 ≥ $400.
Subtracting $60 from both sides, we get:
$10 * d ≥ $340.
Dividing both sides by $10, we get:
d ≥ 34.
Thus, Lilly needs to babysit for at least 34 days to reach her goal.