exam Maths Puzzle Numerical Ability

The length of a room is 4 metres longer than its width. The height of the room
is 3 metres and its volume is 1000m3. Find the length and width of the room.

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exam Other Question
Please help me solve this equation. The problem states : factor completely 6x^5-21x^3+3x^2 I need help and this not from text book 3X^2 - 3X - 60. I get 3x(3-20) Thank you