Question

Formulate a question in words on numerical value of algebraic expression by substitution for grade 9 class. The question must be of such a nature that the learners have to apply problem solving skills in order to answer the question.

Answer 1

Here's an example question:

When I drive at an average speed of 45 mph I can get 6 miles more to the gallon than I can when I drive at an average speed of 60 mph. The other day I drove to a destination at 45 mph average and the day after I drove back at 60 mph average, and my total travelling time was 21 hours. How far away was my destination, and how much fuel did I use over the whole journey to and from the destination if my fuel consumption at 60 mph is 30 miles per gallon?