book Maths Puzzle Numerical Ability

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.45 What is the fractional equivalent? (45/100) but what does the line above the number mean?

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Please help me solve this problem...

x-6> or equal to -16

And.. I have been trying for hours trying to discover a heptagon and i just cant seem to get it.

- x/2<-2 John is 6 years older than his youngest brother Tim. The sum of squares of their ages is 218. How old are John and Tim?