Ally ran 5 miles in 6 minutes. sami ran 6 mile. if ally ran at a faster rate than sami ,in how many minutes could sami have run 6 miles

6 minutes
(not really sure that is what i got)

So you need to set up something called a proportion. You should know what that is. With the ratio(fraction) 5-out-of-6, followed by an equal sign(=), and then the fraction(read carefully!) 6-out-of-n. N is your denominator. Now perform Means and Extremes, or cross multiplying. Multiply 5*n to get 5n. Multiply 6*6 to get 36. Now you need to isolate the variable from 5. Divide 5n to get 'n', and divide 36/5 to get 7.5. You end up with n=7.5. The value of n is 7.5, and that is your answer. To check, replace n with 7.5 in the proportion. Cross multiply to get the two numbers. If equivalent, then congrats, you have the right answer!

The surface area would be 576 because you multiply all the numbers then multiply that number by 6