In a certain village, 200 litres of water are required per household per month. At this rate, if there are 5 households in the village, how long (in months) will 2000 litres of water last? Choose one:
A) 9	B) 5	C) 6	D) 2	E) 4
I find it much easier to understand with real numbers, so choose (almost) any numbers to replace m,n and p:   In a certain village,m 200 litres of water are required per household per month. At this rate, if there aren 5 households in the village, how long (in months) willp2000litres of water last?   Water required is 200*5= 
<gadget id="calculator">200*5</gadget>
<output>1_000</output>
1000 (m*n)   Water available is 2000 (p)   It will last 2 months (p/m*n)   Ans : 2
<result>D</result>
In a certain village, 200 litres of water are required per household per month. At this rate, if there are 5 households in the village, how long (in months) will 2000 litres of water last?