Members of the senior class held a car wash to raise money for their senior prom. They charged $3 for each car and $5 for each van. They earned a total of $275 after washing 75 vehicles. How many cars and how many vans did the senior class wash?

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This law is sometimes called the grouping property. as you can see, regardless of how the numbers are grouped, the answer is still 13. the associative law of multiplication is similar to the same law for addition. it says that no matter how you group numbers you are multiplying together, you will get the same answer.