book Maths Puzzle Numerical Ability

the sum of two numbers is 25. 12 less than 4 times one number is 16 greater than 2 times the other number. What is each number?

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book Other Question

Multiply the rational expressions. Simplify the result.

x^2 + 2x - 3/x + 2 . x^2 + 2x/x^2 - 1
solve for x:
x^4+x^2-12=0