Question

Recall that there are 10mm in 1cm, and that 1cm² covers the same area as 100mm². A rectangular with area 24cm² has length 60mm. Calculate the width of the rectangular in millimetres

Answer 1

...area 24cm² has length 60mm

or
area 24cm² has length 6 cm , so the width is 4 cm, or 40 mm