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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b / b - 1 + 2b / b^2 - 1 The Slope of a line through the point (1,3) is 1.5. If the point (-3,y) lies on the line, find the value of y.