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You just spent $60 on party decorations. The streamers cost $2 per package and paper balls cost $2.50. If you purchased 25 decorations, how many streamers and how many paper balls did you purchase?

Greg, Sam and Pedro went on shopping. Greg and Sam together spent a total of $17. Sam and Pedro spent $20. Greg and Pedro spent $21. How much did each person spent?

A fruit drink manufacturer has a mixture of 100 litres containing w% of pure orange juice. By adding x litres of a mixture containing y% of pure orange juice, he wishes to produce a mixture containing z% of pure orange juice. Find the value of x in terms of w, y and z.