Let's define the variables:
- Let ttt be the number of months after which Jaclyn and Pedro have the same amount of money.
- Jaclyn's initial savings: $120
- Jaclyn's monthly allowance: $40
- Pedro's initial savings: $180
- Pedro's monthly allowance: $20
We want to find ttt such that:
Jaclyn’s savings after t months=Pedro’s savings after t months\text{Jaclyn's savings after }t\text{ months}=\text{Pedro's savings after }t\text{ months}Jaclyn’s savings after t months=Pedro’s savings after t months
Mathematically:
120+40t=180+20t120+40t=180+20t120+40t=180+20t
Now, solve for ttt:
120+40t=180+20t120+40t=180+20t120+40t=180+20t
40t−20t=180−12040t-20t=180-12040t−20t=180−120
20t=6020t=6020t=60
t=6020=3t=\frac{60}{20}=3t=2060=3
Answer:
It will take 3 months for Jaclyn and Pedro to have saved the same amount of money.