book Maths Puzzle Numerical Ability

3/4x-5=4,..

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book Other Question

Evaluate this algebraic expression:

7x squared - 5y divided by zx

for x = -2, y = 3, and z = -5. Bill gave one-third of his jellybeans to a friend, ate two-thirds of the remaining jellybeans, and had eight jellybeans left over. How many jellybeans did Bill have originally?