exam Maths Puzzle Numerical Ability

Please can you help me with this question!!
5(x-3)=2o

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exam Other Question

A boat can travel at 10 mph in still water. It travels 75 miles downstream with the current in the same time it travels 25 miles upstream. What is the speed of the current? I cannot even get started when it comes to writing proofs from scratch. Are we supposed to memorize all of those theorems? There are more than one hundred!

Thanks so much!