exam Maths Puzzle Numerical Ability

One number is 6 less than another number. Their sum is 20. Find the greater number?

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exam Other Question

2x^2 - x - 3/3x^2 + 7x +4 . 3x^2 - 11x -20/4x^2 - 9 i need to find the value of x here and i really need your help... i need the answer today before 6-9 in the morning... thanks...
(4^(x-1))*(3^(x+2))=12^4