exam Maths Puzzle Numerical Ability

LM = 7y + 9
MN = 3y + 4
LN = 143

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exam Other Question

A motorboat has a four-hour supply of gasoline. How far from the marina can it travel if the rate going out against the current is 20mi/h and the rate the rate coming back with the current is 30mi/h? it says solve for x

3^x=4^x

how do i solve?