exam Maths Puzzle Numerical Ability

solve for x x2-6x-160=0 x2 is x squared

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exam Other Question

Solve.
9/10(3+2x) +2>_ 23
The solution is {xlx ? ?} (of course _ is supposed to be under >)
Will someone please help me with this one? One number is 12 more than another. the sum of the smaller number and twice the larger number is 39. Find the larger number.