Factorisation T...

Which of the following is incorrect?

Which of the following statements is correct?

The value of $$\displaystyle \frac { 28xy\left( y-5 \right) \left( y+4 \right)  }{ 14y\left( y-5 \right)}$$ is 

Factorise : $$\displaystyle 40{ m }^{ 2 }n+50mn$$

Simplify: $$\displaystyle \frac { 20xyz\left( 4x+5y+6z \right)  }{ xz\left( 40x+50y+60z \right)}$$

Factorisation of the expression $$\displaystyle 6p-24q$$ results in :

Evaluate: $$\displaystyle \frac { 35\left( x-3 \right) \left( { x }^{ 2 }+2x+4 \right)  }{ 7\left( x-3 \right)  } $$

Divide $$\displaystyle 10{ a }^{ 2 }{ b }^{ 2 }\left( 5x-25 \right)$$ by $$15ab\left( x-5 \right) $$

Divide $$\displaystyle 4{ x }^{ 2 }{ y }^{ 2 }\left( 6x-24 \right) \div 4xy\left( x-4 \right) $$

Simplify: $$\displaystyle \frac { 4-x }{ 4x-16 }$$