exam Maths Puzzle Numerical Ability

(7x2+x+1)-(3x2-4x-3)

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exam Other Question

1) Give the three equtions that would find the temperatures at x1, x2, x3 shown in the figure below, if the temperature of each interior point is the average of its four neighborin One number is 3 less than another. If 10 times the smaller number minus 3 times the larger number is 33, find the two numbers.