exam Maths Puzzle Numerical Ability

HELP..lol. A driver who drives at a speed of r mph for t hr will travel a distance d mi given by d=rt mi. How far will a driver travel at a speed of 56 mph for 4 hr?

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How much 18% acid solution must be mixed with 38% acid solution to create 75 oz of 25% acid solution?

Using variables x & y, write two equations. Geometry. A triangle has sides 3x + 7, 4x - 9, and 5x + 6. Find the polynomial
that represents its perimeter.

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