On a saturday, la petite bakery sold cupcakes, bagels, and rolls in the ratio of 12: 5: 7. the number of cupcakes sold was 50 more than the number of rolls sold.
a) how many cupcakes did la petite bakery sell on saturday?
b) how many cupcakes bagels, and rolls in all did la petite bakery sell on that saturday?

The students at jefferson middle school are raising money for a charity by selling t-shirts and hats. the number of t-shirts sold was 3 times the number of hats. the profit was $5 for each t-shirt sold and $2.50 for each hat sold. the students raised $840 for the charity. they used the system below to analyze their success and found the solution to be (144, 48). 5x+2.50y=840 x=3y how much did they earn from t-shirt sales?