exam Maths Puzzle Numerical Ability

Two business people are arguing over how their respective companies are dealing with the economic downturn. Company A has $2.5 million in the bank, but is losing $250,000 per mont

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The differance between two numbers is 15. When twice the smaller number is subtracted from three times the larger nember, the differance is 58. What is the larger number? can you solve?
A boat moves 7kph in still water. It ravels 45 km upriver and 45 km downriver in a total time of 14 hours. What is the speed of the current?
I am more interested in the work than the answer so please show me step by step.
Thanks