A class records the colour of every car in a car park and draws a pie chart. The circle is cut into 3 slices: white 40%, black 40% and other colours 20%. 30 of the cars are black. How many cars are in the car park?
Opening the drawing…
MathBrush is being tested with a few parent groups, and every solution on the site is open to them. If you were given a code, it goes in once and this device remembers it. 65 worked examples are free to everyone without one.