Tiny-Tot School purchases the same amount of milk and orange juice each week. After price increases from

Question:

Tiny-Tot School purchases the same amount of milk and orange juice each week. After price increases from $1.50 to $1.60 per litre of milk and from $1.30 to $1.37 per can of frozen orange juice, the weekly bill rose from $57.00 to $60.55. How many litres of milk and cans of orange juice are purchased every week?