exam Maths Puzzle Numerical Ability

When fifteen is subtracted from four times the sum of seven and twice some number, the result is 45

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exam Other Question

a rocket is fired upward with an inital speed of 1960 m/s. after how many minutes does it hit the ground? You have 50 microwaves. Out of the 50 you have 4 defective ones. What is the probability that 2 out of the first 5 microwaves sold are defective? and how do I set up the equation?