exam Maths Puzzle Numerical Ability

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?

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A line passing through (11, 3) and (10, y) is parallel to a line with slope -2. What is the value of y? Two houses are for sale on the same street. The second house has 1000 square feet less than twice the square feet of the first house. Together the houses have 4400 square feet. What is the square footage of the first house?