Idon't really upload a lot ok me. ok how do u solve these problem exactly. ex. let's say there are 3 people 1 baby 1 child and 1 adult and in all they weigh 122 kg, and in the other scale there is 1 adult and 2 babies they all weigh 115kg and in the other scale there is 4 babies and 1 adult. lastly, in the last scale there is 1 adult. how much does 1 adult weigh? ?

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?