Maths tip: Many difficult problems can be solved with the "make a supposition" method. It is a very powerful, easy-to-use method. It is very useful for problems where you need to solve for two unknown quantities. Sometimes: – Total is given, Difference is given. – Total is given, Average is given. – Two scenarios are[…]
Maths tip: Here’s the solution to Mr Brown’s question. Did you get it right?
Maths tip: Scenario type questions, sometimes also called "Double-if" questions, are common in the last section of the Maths paper. An example is "Andy and Bob each had a certain amount of money. If Bob gave Andy $40, Andy would have twice as much as Bob. If Andy gave Bob $40, Bob will have thrice[…]