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2013-08-12T13:33:29-03:00
3/7 >>> 8400
2/5 >>>> x

8400*2/5= 16800/5= 3360
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3/7 x= 3360

x= (3360/1)/(3/7)

x= 3360/1 * 7/3

x= 23520/3

x= 7840 litros.
2 4 2