Ellie is saving to buy a phone. She wants to have at least $299 saved before buying one. She currently has $213 saved, and she receives $10 a week as
allowance. In order to find out how many weeks it will take for Ellie to reach at least $299, we can set up the following equation:
213 + 10w ≥ 299
Where w is the number of weeks.
To solve for w, we can subtract 213 from both sides of the equation:
10w ≥ 299 - 213
10w ≥ 86
Next, we can divide both sides of the equation by 10 to solve for w:
w ≥ 86/10
w ≥ 8.6
Since we can't have a fraction of a week, we round up to the nearest whole number. Therefore, it will take Ellie at least 9 weeks to have at least $299 saved.