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# A certain machine produces 8 toys every 4 seconds. If the machine ope

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Math Expert
Joined: 02 Sep 2009
Posts: 52295
A certain machine produces 8 toys every 4 seconds. If the machine ope  [#permalink]

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06 Feb 2018, 02:17
00:00

Difficulty:

15% (low)

Question Stats:

87% (00:36) correct 13% (00:29) wrong based on 57 sessions

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A certain machine produces 8 toys every 4 seconds. If the machine operates without interruption, how many toys will it produce in 2 minutes?

(A) 60

(B) 120

(C) 240

(D) 480

(E) 960

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Re: A certain machine produces 8 toys every 4 seconds. If the machine ope  [#permalink]

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06 Feb 2018, 02:43
1
Toys produced in 4 sec= 8
...........................1 sec= $$\frac{8}{4}$$
...........................120 sec= $$\frac{8}{4}$$*120= 240

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Re: A certain machine produces 8 toys every 4 seconds. If the machine ope  [#permalink]

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06 Feb 2018, 22:44
Given, 8 toys in 4 second.
2 mins =120 sec
120 = 30*4
Total toys = 8*30=240 toys

Ans:(C)
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A certain machine produces 8 toys every 4 seconds. If the machine ope  [#permalink]

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07 Feb 2018, 11:05
Bunuel wrote:
A certain machine produces 8 toys every 4 seconds. If the machine operates without interruption, how many toys will it produce in 2 minutes?

(A) 60

(B) 120

(C) 240

(D) 480

(E) 960

Machine's rate in seconds:$$\frac{8toys}{4secs}$$

Denominator of 4 divides evenly into 60 seconds (4*15 = 60). Multiply numerator by 15, too. Rewrite rate as "per minute."

$$\frac{8toys}{4secs}=\frac{(8*15)toys}{(4*15)mins}=\frac{120toys}{60secs}=\frac{120toys}{1min}$$

How many toys in 2 minutes?
$$\frac{120toys}{1min} * 2 mins = 240$$ toys

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Re: A certain machine produces 8 toys every 4 seconds. If the machine ope  [#permalink]

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08 Feb 2018, 15:48
Bunuel wrote:
A certain machine produces 8 toys every 4 seconds. If the machine operates without interruption, how many toys will it produce in 2 minutes?

(A) 60

(B) 120

(C) 240

(D) 480

(E) 960

The rate of the machine is 8/4 = 2 toys per second.

Since 2 minutes = 120 seconds the machine can produce 2 x 120 = 240 toys in 2 minutes.

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A certain machine produces 8 toys every 4 seconds. If the machine ope  [#permalink]

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08 Feb 2018, 18:30
Bunuel wrote:
A certain machine produces 8 toys every 4 seconds. If the machine operates without interruption, how many toys will it produce in 2 minutes?

(A) 60

(B) 120

(C) 240

(D) 480

(E) 960

If you notice quickly 4 * 15 =60, it will help quickly to solve.

8 toys in 4 seconds ...multiply by 15

15*8 toys in 60 seconds (1 minute).........Do not waste time to get 15 * 8

To get what produced in 2 minutes, just multiply the above by 2.

2*15*8 toys in 120 seconds...Now easy to multiple 2*15*8 =30 * 8 =240

A certain machine produces 8 toys every 4 seconds. If the machine ope &nbs [#permalink] 08 Feb 2018, 18:30
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