exam Maths Puzzle Numerical Ability

The second of two numbers is 3 more than the first. If 4 times the first is increased by the second, the result is 73. Find the numbers.

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I need help graphing Y=log subscript 2 x-3 How many milliliters of a 40% acid solution must be added to 150 milliliters of a 65% acid solution to obtain a 50% acid solution?