 Antique European Feed Sack GRAIN SACK Red Stripes #2383 US $45.00 
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 Antique European Feed Sack GRAIN SACK Red Stripes #2384 US $39.00
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What is the answer to this maths question and what type of question is it?
First, here's the Question
'18 sacks of dog food will feed 21 dogs for 48 days.
if I need to feed 28 dogs, how long will 20 sacks of dog food last?'
Also, what do you call this type of question.
(To get the best answer, please show your working)
Thanks in advance.
let sacks be 's' and let dogs be 'd'
18s = 21d*48 (48 is the number of days it can be fed for)
18s = 1008d
To find how long one sack of dog food lasts:
(divide by 18)
s=56 (one sack can feed one dog for 56 days)
Twenty sacks = 20s.
20s = (20*56) 1120
Divide by the number of dogs (28)
1120/28 = 40
With 20 sacks, you can feed 28 dogs for 40 days.
It is an equation 
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