exam Maths Puzzle Numerical Ability

I just can't seem to grasp the real, rational, irrational, and integer numbers. Any advice for what might be getting in the way of me knowing this stuff?

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I really need help:
In 5 years Chim will be three times as old as Jared. The sum of their ages is 42. How old are Chim and Jared. when a plane flies into the wind, it can travl 3000 km in 6 hours. when it flies with the wind, it can travel the same distance in 5 hours. Find the rate of the plane in still air and the rate of the wind.