book Maths Puzzle Numerical Ability

Evaluate this expression:

a/b for a = 2/3 and b = -5/6

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book Other Question

What is the formula to calculate the length of the diagnal side of a right angle triangle if the other 2 dimensions are known? need to know how to work this question out: if the average time taken to answer calls in the first six months was 20.2 mins and in the next six months was 15.425 than was the %age change greater than 20%?