exam Maths Puzzle Numerical Ability

How many pounds of 70% Columbian coffee must be added to ten pounds of 90% Columbian coffee to have p% Columbian coffee?

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solve this equation x^2+144=0 I would really appreciate help on this equation. Thank you.

The length of a rectangle is 1 cm longer than its width. If the diagonal of the rectangle is 4 cm, what are the dimensions (the length and the width) of the rectangle?