Both questions please

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Let there be  50 cent coins (call them halfs),  10 cent coins (dimes) and  5 cent coins (nickles).   81 coins: Three more dimes than halfs: Nickels are twice halfs plus dimes: Three equations in three unknowns.  We'll eliminate first: Substituting Check we have the right number of coins: Good.   The amount of money is Part 2. a for amount Tim gave cousin.  Initially Tim has $146.65, cousin $10.55 After he gave the money Tim had twice as much: That's the answer to b.  After the transfer the cousin has 


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