Simone earns $ 35 a day at her job, plus $ 4 per hour of overtime. If she made $55 for one day's work, how many hours of overtime did she work

Firstly we need to subtract the amount she earns from normal hours to be left with the amount she earned from overtime.

$55 - $35 = $20.

If Simone earns $4 for one hour of overtime, we can find out how many hours she worked by dividing $20 by $4.

20:4 = 5

Therefore, Simone worked for 5 hours of overtime.