Answer:
Jinfa's paycheck = 318
Explanation:
- We can let x represent Jinfa's paycheck in dollars.
- Since Jinfa spent two-thirds of his paycheck on car repairs, he spent 2/3x dollars.
- Since he then bought a $40 gift for his mom, he spent 2/3x + 40 dollars in all.
Since Jinfa had $66 left, we can use the following equation to find out how much his paycheck was in dollars:
2/3x + 40 + 66 = x
(2/3x + 106 = x) - 2/3x
(106 = 1/3x) / (1/3)
(106 = 1/3x) * 3
318 = x
Thus, Jinfa's paycheck was 318 dollars.