Answer:
More than 26 hours
Explanation:
Ava's salary per hour = $12
Bonus for this week = $40
Let the number of hours she works for earning more than $350 be x.
Then, $12x + $40 > $350
=> $12x > $350 - $40
=> $12x > $310
=> x > $310/$12
=> x > 155/6
=> x > 25.8333...
=> x > 26 [rounding to the nearest whole number]
So, she must work more than 26 ours in order to earn more than $350.