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Bunuel
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Bunuel
Operating at the same constant rate, 4 identical machines can produce a total of 220 candles per minute. At this rate, how many candles could 10 such machines produce in 5 minutes?

(A) 512
(B) 2,200
(C) 2,750
(D) 11,000
(E) 44,000

If 4 identical machine produce a total of 220 candles per minute,
they would produce 1100 candles in 5 minutes.

Since we have been asked to find how many candles 10 such machines make,
we could get that by multiplying the candles by a factor of 2.5(because 4*2.5 = 10)

Therefore, 10 such machines produce 1100*2.5 = 2750 candles(Option C)
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4 machines in 1 minute = 220
so 1 machine in 1 minute = 220/4 = 55
so 10 machines in 1 minute = 55*10 = 550
so 10 machines in 5 minutes = 550*5 = 2750

Hence C answer
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I got C, first I figured out how many candles a machine makes per minute. 220/4 = 55.
-Next I plug that into the equation 55 per minute * 5 minutes * 10 machines = 2,750.
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Bunuel
Operating at the same constant rate, 4 identical machines can produce a total of 220 candles per minute. At this rate, how many candles could 10 such machines produce in 5 minutes?

(A) 512
(B) 2,200
(C) 2,750
(D) 11,000
(E) 44,000

We can determine the rate of 10 machines with the following proportion:

4/220 = 10/x

4x = 2200

x = 550

We know that 10 machines can produce 550 candles in one minute. Thus, in 5 minutes, 10 machines can produce 550 x 5 = 2750 candles.

Answer: C
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Bunuel
Operating at the same constant rate, 4 identical machines can produce a total of 220 candles per minute. At this rate, how many candles could 10 such machines produce in 5 minutes?

(A) 512
(B) 2,200
(C) 2,750
(D) 11,000
(E) 44,000

Given: 4 machines produce 220 candles per ONE minute
So, 1 machine produces 55 candles per ONE minute
Therefore, 10 machines produce 550 candles per ONE minute
And 10 machines produce 2750 candles per FIVE minute

Answer: C

Cheers.
Brent
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First, we will keep the time constant at 1 minute and use unitary method to connect machines and candles.

1 minute: 4 machines —— 220 candles
1 minute: 1 machine —— 220/4 = 55 candles

So, 1 minute: 10 machines —- 55(10) = 550 candles —- (A)

Now, we will keep number of machines constant at 10 and use unitary method to connect minutes and candles.

We can rewrite relationship (A) as:
10 machines: 1 minute —— 550 Candles

Finally,
10 machines: 5 minutes —— (550)(5) = 2750
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