Jerry and thomas own a cleaning business. thomas cleans a house in 2 1/2 hours . jerry cleans a house in 3 1/4 hours. how much longer does it take jerry to clean a house than thomas

Jerry takes 0.75 hours or hours more to clean house than thomas

Given that Jerry and Thomas own a cleaning business

Thomas cleans a house in hours and Jerry cleans a house in hours

To find: Number of hours more Jerry takes to clean than thomas

Number of hours more Jerry takes to clean than thomas = time taken by Jerry - time taken by thomas

Time taken by Jerry =

Time taken by Thomas =

Substituting the values in above formula,

Number of hours more Jerry takes to clean than thomas =

On solving we get,

Thus Jerry takes 0.75 hours or hours more to clean house than thomas

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this