exam Maths Puzzle Numerical Ability

please help: Placing planks of equal length end to end, jules found that 3 planks were one foot short of the porch length, while 4 planks were two feet too long. How long was each planks?

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exam Other Question

An open tank with length 20 cm and width 15 cm holds 4.8 litres of water.Calculate the height of the water level in the tank and the total surface area of the cuboid in contact wit I am stuck on correct answer for:

if the width of a rectangle is one-third of its length and its length is 12, what is the area of the rectangle?

I am not using any specific book. I am just practicing..