exam Maths Puzzle Numerical Ability

this is a type of problem i was unable to solve. i was given the perimeter of a scalene triangle which was 1000m and asked to find its area. please can you help me solve this problem.thanks.

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exam Other Question
which of the following is the equivalant to the rational number x-2/x(x+2)
a. 4x-8/-4x
b. 4x/4x^2-2x
c. x-8/2x^2-8x
d. 4x-8/4x^2-8x Solve each system by substitution. Determine whether each system is independent, inconsistent, or dependent

3x - 2y = 7
-3x + y = 5