book Maths Puzzle Numerical Ability

find the opposite of 4/11. express yor answer as a common fraction?

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book Other Question

I am not sure if I am doing this question right or not. Reduce the fraction.

-20t^5 u^2 v^3
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48t^7 u^4 v

I think the answer is

-5v^2
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12t^2 u^2

Am I right? The number of students in the psychologhy class is 34 fewer than the number of students in world history. The total enrollment for the two classes is 134 students How many stduents are in each class.