Running at the same constant rate, 6 identical machines can produce a total of 270 bottles per minute. At this rate, how many bottles could 10 such machines produce in 4 minutes? Pick
A) 1800  B) 900  C) 2500  D) 2700  E) 2900
Explanation:   Let required number of bottles be xx   More machines, more bottles (direct proportion)   More minutes, more bottles(direct proportion)   Hence we can write as   (machines) 6:10   (minutes) 1:4}::270:x   ⇒6×1×x=10×4×270   ⇒x=10×4×270/6   =10×4×90/2   =10×4×45=1800   1800nswer: Option 1800
<result>A</result>
Running at the same constant rate, 6 identical machines can produce a total of 270 bottles per minute. At this rate, how many bottles could 10 such machines produce in 4 minutes?