book Maths Puzzle Numerical Ability

Jenny has 175 coins in a jar. They consist of nickels and dimes only. The total value of the 175 coins is $11.90. How many nickels and dimes are there in Jenny's jar?

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book Other Question

Solve each system by the addition method
x + y = 13
22x + 36y = 356

Solve each system by the addition method. Determine whether the equations are independent, dependent, or give the coordinates of the focus and the equation of the directrix for the parabola with equation x=-4y^2