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kaplan picking numbers

by resilient » Wed Mar 19, 2008 4:59 pm
I thought I was decent at picking number and forcing an answer out. Untill this question.

If snow falls at a rate of x cm per minute, how many hours would it take for y centimeters to fall?

a. x/60y
b.y/60x
c.60x/y
d.60y/x
e.60xy

qa is y/60x
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following through

by resilient » Wed Mar 19, 2008 5:40 pm
I set up a proportion,

1 minute/X cm =M (minutes)/Y cm

m= y/x then simply convert from minute to hour

THIS IS THE TRICKY PART

I converted but came up wth 60x/y but answer is y/60x. what went wrong?
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Re: following through

by camitava » Wed Mar 19, 2008 6:01 pm
Enginpasa1 wrote:I set up a proportion,

1 minute/X cm =M (minutes)/Y cm

m= y/x then simply convert from minute to hour

THIS IS THE TRICKY PART

I converted but came up wth 60x/y but answer is y/60x. what went wrong?
Enginpasa1, u were correct in ur approach but ... OK! Now look, u know that y/x min is required to fall y cm. now u need to convert this y/x min into hour.
For that, 60 min -> 1 hr
1 min -> 1/60 hr
y / x -> y/60x hr.

Now got it, enginpasa1 ...
Correct me If I am wrong


Regards,

Amitava
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yes

by resilient » Wed Mar 19, 2008 6:47 pm
thank you.

I noticed that I am losing points less now a days to word problems. HOWEVER< if I do lose points its because of not applying simple logic and getting far too deep into a problem than is needed. In essence, I am making the problem harder than it really is.

my initial approach to this was picking numbers, which is ok but so much loinger than just stepping back and looking at the question for a second!
LEsson learned? Hope so!
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Re: kaplan picking numbers

by aarunibens » Wed Mar 19, 2008 10:35 pm
x cm = 1 min = 1/60 hr

1 cm = 1/60x hr

Hence, y cm = y/60x hr
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by tmmyc » Thu Mar 20, 2008 9:02 am
Think about it as you would a (d=r*t) problem.

(Amount of snow) = (Rate of snow fall) * (Time)


Amount of snow: y cm
Rate of snow fall: x cm / min which you calculated as 60x cm / hr
Time: t


y = 60x * t

t = y/60x
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