book Maths Puzzle Numerical Ability

2x-2=6

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The sum of the angle measures of any triangle is 180 degrees. Find the angle measures of a triangle if the second angle measures 10 degrees less than twice the first, and the third angle measures 25 degrees more than the second. I have no idea how to solve this problem

The cooling system on a truck contains 5 gallons of coolant that is 40% antifreeze. How much must be withdrawn and replaced with %100 antifreeze to bring the mixture to 50% antifreeze?