exam Maths Puzzle Numerical Ability

A line passing through (11, 3) and (10, y) is parallel to a line with slope -2. What is the value of y?

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How can I solve 13 times the square root of 5 minus the square root of 10 when it has to be multiplied by 3 times the square root of 2 plus 4 times the square root of 5 and this pa Painting A painter wishes to mix paint worth $15 per gallon with paint worth $18 per gallon to make a 12-gallon mixture worth $16.75 per gallon. How many gallons of each should he mix?