The conservation club washed 24 cars and earned $144 on saturday. at this rate, how much money did they make on sunday washing 30 cars? a. $198 b. $180 c. $174 d. $150

To find this answer, you must first find out how much each car makes them. You do 144 divided by 24 to do this. You get the answer 6. Which means that they make $6 for each car washed. 

Now that you know how much each car wash makes them, you multiply 6 by 30 to get how much they earned on Sunday. 

6 x 30= 180.

So, they earned B.$180 on Sunday