exam Maths Puzzle Numerical Ability

A student makes a $9.25 purchase at a bookstore with a $20 bill. The store has no bills and only quarters and fifty cent pieces for change. There are 30 coins total given back to t

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4) Perform the operation: (5x2 - 3x - 9) + (2x2 - 7x + 4)

5) Multiply: [(1/4)z + (1/3)][(1/4)z - (1/5)]

6)Simplify and evaluate:
(22x5y-3z4/40x-2y-8z5)3

thank you very much A sewer-cleaning company charges an inital fee of $1.00/ft for 100 feet of sewer line and the charge increases by $0.50 per foot for each additional 100 feet of line. If a potentia