Problem Solving including mixed & several step problems are commonly tested in 11+ and Selective School exams in the UK.
Example Question 1:
Zaina wants to paint her room a brighter colour. She estimates that she will enough green paint to cover 60m² and that she will need to do 2 coats of the paint. Paint comes in 1 litre tins that cover approximately 12m². The cost of this paint is £12. How much will Zaina need to spend to paint her room?
Explanation: First find out how much paint is needed = 60m² area of the walls ÷ 12m² coverage of the paint = 5. Secondly, double that amount to provide 2 coats of paint = 10. Thirdly, multiply the number of tins required by the cost of one time (£12) = £120