exam Maths Puzzle Numerical Ability

if a single roll of wallpaper will cover 3 square meters, how many single rolls will it take to cover a will 2 meters x 5 meters?

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Please help, I am stuck again.....

Use a coefficient of friction of 0.4 in the formula from example 6 and find the speeds of cars that left skid marks oflenghts 150 feet, 200 fe
Please help me solve this problem: The graph of a^2 + 8a + 16 is?
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