exam Maths Puzzle Numerical Ability

6/13 of the athletes could complete the obstacle course. If 14 of the athletes could not complete the course, how many could complete it?

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exam Other Question

please help me
Use long division to divide {{{6x^3+x^2-12x+5}}} by {{{3x-4}}}
Find the exact value of the expression

cos(pi/12)cos(3pi/4) - sin(pi/12)sin(3pi/4)


I appreciate your help!