exam Maths Puzzle Numerical Ability

Jonathan has 136 coins in this collection of dimes and quarters. If the coins have a total value of 528, how many are dimes and how many are quarters?

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exam Other Question
Write three quadratic equations with a,b,c (coefficients of x^2, x and the constant) as
1. integers
2. rational numbers
3. irrtional numbers this one I am definitely confused,it is asking to write in the simplest form

y-2/y+3-y/2y+6=

please help show me how to do this.