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Making a Chart can also help, especially on the more difficult ones:
Start with what you know. 40% are third year students. 70% ARENT second year students. So 30% are Second year students and the 70
% are either first year or 3rd year. You know third year is 30%. Whats left?
Year 1 30
Year 2 30
Year 3 40
Then just divide the ratio- part/whole 30/60 (are NOT third year_
the best way is to understand the concept and logic things out, WITHOUT formulas even. Thats the advice that ian777 i think gave and it works for me. Think about how many formulas u have to memorize, each one beingdifferent. Some are close versions nd u have to decide which one to use etc...its much easier to logic things out for test day. Simplify and not complicate