exam Maths Puzzle Numerical Ability

An 18-ft board is cut into two pieces, one of which is 4 ft longer than the other. How long is each piece?

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exam Other Question

A triangle has sides 3x+7, 4x-9, and 5x+6. Find the expression that represents its perimeter.
Hello again. Last question it is again about the tsunami word problem but its another question. SQUARE ROOT 9.8*4000. I am really confused.