exam Maths Puzzle Numerical Ability

1/r=1/s+1/t....solve for s

w=a^2/t.....solve for t

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question is reduce the rationals expression to the lowest terms

3x^2 - 9x+6 over 10-5x Mary has 84 coins that have a total value of 5.55$. if all the coins are nickels and dimes. How many of each does mary have?