i need help for asvab

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January 21st 2009, 07:40 PM
patpatrickc

i need help for asvab

i am 34 and getting ready for the asvab and i do not know how to answer some of the questions. they all look like there should be a formula for them but i cant figure this out it may be basic but i need help...not the answers but how to do them here are some of the questions ............ If Steven can mix 20 drinks in 5 minutes, Sue can mix 20 drinks in 10 minutes, and Jack can mix 20 drinks in 15 minutes, how much time will it take all 3 of them working together to mix the 20 drinks?..................Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the same job in 1 ½ hours. How quickly can all three fill the pool together? ..................... If Sam can do a job in 4 days that Lisa can do in 6 days and Tom can do in 2 days, how long would the job take if Sam, Lisa, and Tom worked together to complete it?..............thx hope someone can help me
January 21st 2009, 08:23 PM
katchat64

Whatever you do, do not freak out when you see these problems on the asvab. I have taken this test before and it seems difficult at first but all these problems are, are just word problems. Usually you do not need to know any special formulas.

If Steven can mix 20 drinks in 5 minutes, Sue can mix 20 drinks in 10 minutes, and Jack can mix 20 drinks in 15 minutes, how much time will it take all 3 of them working together to mix the 20 drinks?

In this problem, you need to think of proportions.

I believe that you add up all of the minutes together and divide by the number of drinks.
January 21st 2009, 11:54 PM
princess_21

Quote:

Originally Posted by patpatrickc

i am 34 and getting ready for the asvab and i do not know how to answer some of the questions. they all look like there should be a formula for them but i cant figure this out it may be basic but i need help...not the answers but how to do them here are some of the questions ............ If Steven can mix 20 drinks in 5 minutes, Sue can mix 20 drinks in 10 minutes, and Jack can mix 20 drinks in 15 minutes, how much time will it take all 3 of them working together to mix the 20 drinks?..................Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the same job in 1 ½ hours. How quickly can all three fill the pool together? ..................... If Sam can do a job in 4 days that Lisa can do in 6 days and Tom can do in 2 days, how long would the job take if Sam, Lisa, and Tom worked together to complete it?..............thx hope someone can help me

drinks/minutes
Jim 20/5= 4
Sue 20/10= 2
Tony 20/15= 4/3

4+ 2+ 4/3 = 20/x
22/3=20/x
22x= 60
x=2.72 minutes
correct me if i am wrong :)

If Sam can do the entire job in 4 days, Tom in 2 days and Lisa in 6 days then:
job completed per day will be:
Sam= 1/4
Tom= 1/2
Lisa= 1/6
together= x
to find out how much they can do the job together per day, add what they can do per day that is:
1/4 + 1/2 + 1/6 = (3+6+2)/12 = 11/12
let x be how long they will take to do the job together. they can do 1/x per day,
11/12= 1/x
11x=12
x=1.09 day
January 22nd 2009, 04:09 AM
patpatrickc

ok these work but

thanks for the help i understand all of that now but i am not so bright how do i convert the 2.72 into seconds i understand 2 minutes but how many secs is .72
January 22nd 2009, 04:36 AM
princess_21

Quote:

Originally Posted by patpatrickc

thanks for the help i understand all of that now but i am not so bright how do i convert the 2.72 into seconds i understand 2 minutes but how many secs is .72

$(.72) minutes * \frac{60seconds}{1minute}$

$= 43.2 seconds$

you can cancel minutes that leave seconds as the unit.
:)
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