book Maths Puzzle Numerical Ability

A rectangular field is three times as long as it is wide. if the perimeter of the field is 400 yards, what are the field`s dimentions?

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book Other Question

if p represents a true statement, wlile q and r repersent false statements.
i need to find the truth value of the compound statement
~(q downward arrow ~r) arrow right ~p

i g The area of a square is given by A=S second power. What is the area of the squares whose sides are 5,10,12 and 15cm?