exam Maths Puzzle Numerical Ability

five times the diffrence of a number and one yields the same result as twice the same number increase by three

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How many liters of a 40% solution of HCI are added to 2000 liters if a 20% solution to obtain a 35% solution? 1. A rectangular garden has dimensions of 18 feet by 13 feet. A gravel path of uniform width is to be built around the garden. How wide can the path be if there is enough gravel for 516 square feet?