exam Maths Puzzle Numerical Ability

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?

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Two trucks start from the same point traveling in different directions, One truck travels at a speed of 54 mi/h , the other at 48 mi/h. How long must they travel to be at least 408 mi apart? Simplify :1. 5c/ c-d + 5d/d-c 2. 4x+3/3 - 7x/4 + x-3/6