Most children can understand abstract symbols and solve complex problems by the time they are "12" years old.
At this age the kid will have the capacity to accomplish more troublesome and complex errands that require rationale, similar to math issues. Be that as it may, while their capacity to utilize sensible reasoning has propelled, their rationale may have certain impediments amid this period: the "here and now" will dependably be simple. Kids at this age will at present not utilize unique reasoning. At the end of the day, they will have the capacity to apply their insight to a subject that they don't have the foggiest idea, yet it's as yet troublesome at this age.