Two families compare pocket money. The 3 children in the Tan family get 22 dollars a week on average. All 5 children together get 20 dollars a week on average. What do the Lim children get on average?
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.