exam Maths Puzzle Numerical Ability

Please help me solve this equation: (8/3n)-(15/5n^2)

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exam Other Question

Solve using the addition and multipication principles.
-1 < 4x + 15 - 2x

The soulution set is {x/x >__} Sam emptied his collection of nickels and dimes on his bed. If his 46 coins were worth $3.10,how many coins of each type did he have?