Problem 2: One of the workers in the jam factory mixed one barrel of jam containing 14% of sugar with another barrel of jam containing 30% of sugar. The new
mixture weighs 80 kilograms and contains 20% of sugar. How much jam was in the ﬁrst barrel? How much was in the second barrel?
It is sometimes difficult to find problems that create true dilemmas for students. This series of problems creates the dilemmas through conversation with an interviewer as the learner interprets the problems in a verbal exchange.