exam Maths Puzzle Numerical Ability

I need help please...I dont understand....it reads as follows:
L varies inversely as W. Find the constant of variation if L=40 and w=50

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Find the measure of an angle such that the supplement is five times the angle. This is an extra credit question for my Honors Geometry Class-- I am in 8th grade

If a coin is flipped 4 times, find P (exactly 3 heads).

I do not know what my teacher is looking for- PLEASE HELP

THIS IS NOT A TEXTBOOK QUESTION!