NRICH - Warmsnug Double Glazing

Area and Perimeter, Simultaneous Equations
Key Stage: 3 ★

Warmsnug has calculated the price of each window according to the amount of glass and frame needed. How did they do this? Which

window has an incorrect price?

This problem offers students a chance to develop strategies for organising and understanding situations where the information arrives

all jumbled up with occasional errors, within the context of calculating areas and perimeters of rectangles.
The problem is also ideal for considering the variety of methods of generating and solving simultaneous equations.

This resource has comprehensive teachers' notes and resources, linked from the problem page. This includes possible approaches and

key questions, as well as possible support and extensions.


The file attached is a HTML file, which, when opened, automatically redirects you to the problem on the NRICH website.