exam Maths Puzzle Numerical Ability

I really dont get how to do this. Here it is- Jacob has $3.50 in nickels and dimes. He has twice as many dimes as nickels. How many nickels and how many dimes does he have?

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Given the function m(w)= 3w-2/ 2w+1. Write w as a function of m. Four fishermen collected fish. Each one (sequentially) took turn to take his (equal) share of fish from the pile, leaving an ever decreasing remainder for the next guy. If after al