exam Maths Puzzle Numerical Ability

4+2(x-8)

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If one gallon of stain covers 350 square feet, what is the least number of gallons of stain you need to cover the floor of a rectangular deck that is 25 feet long and 16 feet wide? I'm having trouble with questions 50 and 58 in chapter 9 section 9.3 and I'm also having trouble with problem 54 in chapter 9 section 9.4. Please help!