exam Maths Puzzle Numerical Ability

On Monday, Serena averaged 40 mph while making sales calls. On Tuesday, she drove for 2 hours more than she did on Monday and averaged 50 mph. If her total distance for the two days was 280 miles, then how many hours did she drive on Monday?

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Use long division to divide {{{6x^3+x^2-12x+5}}} by {{{3x-4}}} (i) When x = 5, the integer x² -1=24 has 8 divisors: 1, 2, 3, 4, 6, 8, 12, and 24
Determine for which odd positive integer x between 2 and 20, the number x² -1 had the largest num