exam Maths Puzzle Numerical Ability

Prove the following statement:

If a triangle has one obtuse angle, then the other two angles are acute.

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exam Other Question

use elimination to solve each system of equations

One number added to twice another number is 23. Four times the first number added to twice the other number is 38. What are the numbers? The Chunnel connects the United Kingdom and France by a railway tunnel under the English Channel. The British started tunneling 2.5 months before the French and averaged 0.63 kilo