Qr

[future_dentist]

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A software can complete 5000 piece order in 4days. Another software can complete the same order in 5 days. How long would it take them to do together...

A 2days
B 3days
C 3 1/2 days
D 4 days
E 4 1/2 days

Ans: B

 

[DonExodus]

1/4 + 1/5 = 9/20 = 1/T

T= 20/9, or 2.22 days.
The next highest answer is 3 days, B. Thats ****ty though, should have 2.2 as an answer IMO :/

 

[tuan209]

yea,

well 2.2 days is actually three days! 😀

5000/4 = 1250 per day

5000/5 = 1000 per day

therefore in one day 2250 can be produced. 5000/2250 = 2.2

 

[Envision]

AB/A+B= new rate

its the same thing, but i find this way a little faster.

4x5/4+5= 20/9~2.2

 

[Blando]

wow, that is quick, seriously, i am always usually stumped on those.

 

[KingChris]

wow, that is quick, seriously, i am always usually stumped on those.

those types of q's are def fair game to show up again on test day. 🙂

 

[aggie-master]

I got 2.222 also. Every question that I encountered on the real DAT had the exact answer as one of the choices.