exam Maths Puzzle Numerical Ability

The average of the intergers from 200 to 400, inclusive, is how much greater than the average of the integers from 50 to 100, inclusive?

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exam Other Question

48. x/(x-2)-(x+1)/x=8/(x^2-2x)

56. 5/(x+6)+2/(x^2+7x+6)=3/(x+1)

Will someone please, please help me to...

Solve and check each of the following equations for x.
Determine the solutions for the following polynomial.
9x^5 - 21x^4 = 0