exam Maths Puzzle Numerical Ability

Simplify :1. 5c/ c-d + 5d/d-c 2. 4x+3/3 - 7x/4 + x-3/6

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A store is selling Compact Discs (CDs)for $10.50 and $8.50. You buy 10 cds for $93. How many cds bought at each price? You shoot an arrow straight up at 50 m/s. When will it run out of speed?