exam Maths Puzzle Numerical Ability

i dont get any of it and i think i should chengeto regular 7th grade math instead in stead of skipping.

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exam Other Question

Find the dimensions of a rectangle whose length is 40 inches more than its width and whose perimeter is 300 inches. please help me solve this equation: {{{(3x-45/-4-8x)(4x^2-1/-x+15)}}}