book Maths Puzzle Numerical Ability

the car traveled 28 miles in 30 minutes how fast was the car going

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) Use the techniques learned in section 6.7 to solve the following word problem: It takes Steven 8 hours to clean the yard and mow the lawn. He and his brother Daniel can do the yearly average of 35.18% and another of 33.43%, these are my answers but Im not sure how to figure out the number of successful repairs each candidate would make on 50 calls?

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