exam Maths Puzzle Numerical Ability

Please show me how to solve:

(100p-4000)/100p=.3

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exam Other Question

the peak of tanzanias mountain kilimanjaro stands 19,340 feet above sea level.
What is the integer that best expresses the given number. can someone please check this please?

3y/y^2+5y+4
plus
2y/y^2-1=
2y^2-1=(y-1)(y-1)
y^2+5y+4=(y+1)(y+1)