Mixtures

Thirty quarters and nickels have a value of $5.50. How many of each?

Two hundred and eighty tickets were sold for a soccer game for a total of $240. Adults tickets cost $1.50 and student tickets cost $.50. How many of each type were sold?

A collection of nickels and quarters have a value of $2.40. There are three times as many quarters as nickels. How many of each type of coin?

A sack of cashews and pecans sells for $6.25. The cashews sell for $4.50 a pound and the pecans sell for $3.50 a pound. How many pounds of each are in the sack?

A sack is full of $5 and $10 bills. There are twice as many $5s as $10s. But there are 3 fewer $10s than $5s. How many of each?

A jar contains red and white marbles. There are one third as many red as white marbles, while there are two more white marbles than red. How many of each?