Quote:
Originally Posted by zorrillo
Rule of 3:
A car travels 50 km in 30 mins. How many kms does it travel in 15 mins?
30 mins == 50 kms
15 mins == ?
Rule of 5:
3 machines print 25 pages in 40 secs. How many pages do 5 machines of the same type print in 20 secs?
3 machines == 40 sec == 25 pages
5 machines == 20 sec == ?
Easy. They are called so because of the number of terms involved; 3 and 5 resp.
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3 machines x 40 seconds = 120 machine-seconds make 25 pages
120 machine-seconds / 5 machines = 24 seconds for 5 machines do 25 pgs
Ratio: 24 secs/ 25 pgs = 20 secs/ x pgs
25(20) = 24x
x = 20.83 ?
5 machines in 20 seconds make 20.83 pages? Is this correct? Please advise.