exam Maths Puzzle Numerical Ability

x=3-3y
y+3y=-6

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The ratio of the measures of the length and width of a rectangle is 5:7. The area of the rectangle is 1,715 square feet. Find the dimensions. In a survey of 150 adults, 66% said they have a savings account, 36% said they owe money on a loan, and 8% said that they neither save nor owe money. How many of the respondents have both a savings account and a loan?