exam Maths Puzzle Numerical Ability

Cheapo Rent-a-Car charges $20 per day and $.40 per mile. Cheatem Rent-A-Car charges $15 per day and $.50 per mile. What range of miles per day would you drive to make Cheatem the b

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Please help me solve this problem:

5-2*2+8*5-2=28

I was asked to add parenthesis where it makes the problem equal 28. I could not figure it out, please help. The reciprocal of 6 plus the reciprocal of 8 is the reciprocal of what number?