exam Maths Puzzle Numerical Ability

If 6 men can do a piece of work in 4 days, how many men are needed to do the work in 21 days?

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Please help me solve this.

Solve for y in terms of x:log2x+log2y=1

This is all i have so far: log2xy=1 and log2 rewrites as b^p=n

So, b=2 p=1 and n=xy
What do i do after this? solve this.

(x+8)(x+1)=-12