exam Maths Puzzle Numerical Ability

A health food store sells seasoning blends in bulk. One blend contains 20% basil. Shelia wants to add pure basil to some 20% blend to make 16 ounces of her own 30% blend. Let b represent the amount of basil Shelia should add to the 20% blend.

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Find the work done by the constant force 4i - 2j if the point of application moves along the line segment from P(1,1) to Q(5,7). If a ball is tossed in the air from a height of 6 feet with a velocity pf 32 feet per second, then its altitude at time t(seconds) can be described by the function A(t) = -16t2 + 32r + 6. Find the altitude of the ball at 2 seconds.