book Maths Puzzle Numerical Ability

Jill has $3.50 in nickels and dimes. If she has 50 coins, how many of each type of coin does she have?

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John owns a hot dog stand. He has found that his profit is represented by the equation P=-x(squared)+70x=76, where P represents profits and x represents the number of hot dogs sold How do i find 2/3 of the supplement