book Maths Puzzle Numerical Ability

A collection of nickels, dimes and quarters has a value of $7.50. If there are 3 fewer dimes than nickels and twice as many quarters as nickels, how many dimes are there?

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book Other Question

Explain what the value of the discriminant means to the graph of {{{ y = ax^2 + bx + c }}}. Hint: Chose values of a, b and c to create a particular discriminant. Then, graph the c solve ea. proportion

m-1/m-2=m-3/m+4