Math
posted by Lynn .
You work at a grocery store. You hourly rate is greater after 6:00p.m. than it is during the day. One week you work 20 daytime hours and 20 evening hours and earn $280. Another week you work 30 daytime hours and 12 evening hours and earn a total of $276. What is your daytime rate? What is your evening rate?

set up an equation.. for example
d = daytime
e = evening
20d+20e=280
then 30d+12e=276
then you can use substitution and solve