exam Maths Puzzle Numerical Ability

(4x-9y)-(5x-7y)+(2x-5y)

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exam Other Question

How much water must be evaporated from 32 ounces of a 4% salt solution to make a 6% salt solution? Log4260 = log4(4^x + 3 plus 4^x)

please note the 4 in the log 4260 is small and the 4 in the log4 is also small

HOw to get to the answer of x = 1?