exam Maths Puzzle Numerical Ability

Please help me solve this formula for the specified variable:

1/a+1/b=c for b

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exam Other Question

please help me I do not understand this problem.

Evalute pqa + p-q if p=6,q=1/2,and a=5 A search plane has a cruising speed of 250 miles per hour and carries enough fuel for at most 5 hours of flying. If there is a wind that averages 30 miles per hour and the directio