20% of the cars in a car park are red. 40 cars are not red.
how many cars are in the car park?

Twelve less than a number is at most 20

The pyraminx is a rubik's cube-type toy in the shape of a tetrahedron. the pyraminx shown below has edges 15\,\text{cm}15cm long and vertical height h=12.2\,\text{cm}h=12.2cm. the triangle drawn with dashed lines is a right triangle. what is the distance rr? round your answer to the nearest tenth.

Find the circumference of a pizza with a diameter of 10 inches round to the nearest tenth