exam Maths Puzzle Numerical Ability

Marie can eat a cake in 10 minutes. Anne joins her after 3 minutes. Together they eat the rest of the cake in 4 minutes. How long would it take Anne to eat the cake alone?

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Can you please help me:
Divide using long division:
(12x²-35x+8)/(4x-1) find the first four terms of the sequence a)a n below =n^3 + 1 B) a 1below = 4; a n below a =3a n-1 below + 1
thank you