exam Maths Puzzle Numerical Ability

The Randolphs used 12 more gallons of fuel in October than in September and twice as much oil in November as in September. If they used 132 gallons for the three months, how much was used during each month?

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Solve the system of equations using the Addition method.

2a + 3b = -1
3a + 5b = -2 The length of a rectangle is 5cm more than 3 times the width. If the area of the rectangle is 92cm^2, find the dimensions of the rectangle to the nearest thousandth.