A computer can perform z calculations in s seconds. How many minutes will it take the computer to perform k calculations?
Choose the correct answer:
A) ks/60z  B) ks/z  C) 60ks/z  D) 60z/ks  E) k/60zs
As 'thick' as this question might look, it's actually a fairly straight-forward Rate question and can be solved by TESTing VALUES.   We're told that a computer can perform z calculations in S seconds.   Let's TEST....   z = 2   S = 3   2 calculations every 3 seconds =   40 calculations every 1 minute   We're asked how many MINUTES it will take to perform K calculations.   Since we already know that the computer can perform 40 calculations in 1 minute, let's TEST...   K = 80   So we're looking for an answer that = 2 when z = 2, S = 3 and K = 80   Answer A:KS/60z = (80)(3)/(60)(2) = 2 This IS a match   Answer B: KS/z = (80)(3)/2 = 120 This is NOT a match   Answer C: 60KS/z = 60(80)(3)/2 = 7200 This is NOT a match   Answer D: 60z/KS = 60(2)/(80)(3) = 1/2 This is NOT a match   Answer E: K/60zS = 80/(60)(2)(3) = a fraction. This is NOT a match   ks/60z
<result>A</result>
A computer can perform z calculations in s seconds. How many minutes will it take the computer to perform k calculations?