exam Maths Puzzle Numerical Ability

A rectangular swimming pool is twice as long as it is wide. A small walkway surrounds the pool. The walkway is a constant 2 feet wide and has an area of 196 square feet. Find the dimensions of the pool.:

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Please help me!The problem is:
An investment of $1500 paid interest of $45 during a certain period. How much interest would an investment of $2000 invested at the same rate for the same length of time pay?
Please and Thank you=) The line

y=0.15x+0.79

represents an estimate of the average cost of gasoline for each year. The line
0.11-y= -0.85



estimates the price of gasoline in January of