exam Maths Puzzle Numerical Ability

3y+z=am-4y for y This is chapter 3 section 8

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2 out side square root of 72 subtracted by 5 out side square root of 50 Science and Medicine. A plane flies 720 mi against a steady 30 mi/h headwind and then returns to the same point with the wind. If the entire trip takes 10 h, what is the planes spe