book Maths Puzzle Numerical Ability

Formula: 1020 square root of P (1-.01 square root of P)=G
If P is the population in thousands, this formula is the amount of water in gallons per minute the city needs.
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find the least common denominator fpr these two rational expressions
-3 -6
x 8x^2 2x2 and 3x3 Systems: answer has to be in ordered pairs, or ordered triples.

Question 1. 2(x-3y)+3(y-2)= 4(x-y)-5
3/2x - 5/6y = -1

Question 2. 2x - y + z= -4