Question

the quantities s and t are positive and are related by the equation s=k/t, where k is a constant. if the value of S increased by 50 percent, then the value of T decreases by what percent???

Answer 1

is this a ratio ques??

Answer 2

well if you solve for t
t = k/s
Increasing by 50% is equivalent to multiplying by 1.5
t = k/(1.5s)
1/1.5 = 0.667
t = 0.667(k/s)
t decreased by 33.3%

Answer 3

well how did you get t=k/s

Answer 4

solve for t
s = k/t
multiply by t on both sides
t*s = k
divide by s on both sides
t = k/s

Answer 5

how did you conclude that increasing by 50% is equivalent to multip by 1.5

Answer 6

50% = 0.5
s + 50%s = s+0.5s = s(1+0.5) = 1.5s

Answer 7

ok...

Answer 8

so whenever something is increased i add the variable +.05 to x(1+.05)...also what would I do for a decrease ques??

Answer 9

if something decreases by say 30%
x - 0.3x = x(1-.3) = 0.7x

Answer 10

ok..cool thanks

Answer 11

your welcome

Answer 12

why did you 1/1.5?? becuz k or 1k/1.5s??

Answer 13

ok ok i got it

Answer 14

but did you convert .667 into 33.1/3 %

Answer 15

got it?
t = k/s
the 1/1.5* (k/s) is the new value of t

t is now 66.6% of its old value
100% - 66.6% = 33.3%
so it decreased by 33.3%

Answer 16

got it thanks.. can i throw another ques at u??

Answer 17

sure go ahead

Answer 18

if x and y are the tens digit and the units digit, respectively, of the product 725,278x67,066, what is the value of x+y?

Answer 19

studyn for gre..thanks

Answer 20

wait, couldn't you just multiply them together and look at the last 2 digits

Answer 21

ok..i thought they would explicity state tens(which they did) and ONES digit....so units digit is equiv to ones digit?? or am i thinkn too much into it??

Answer 22

oh yeah units is same as one's place
im guessing you can use a calculator

Answer 23

yea they provide one..can i throw one more ques at you??

Answer 24

sure,
actually the product ends up being too big, you get a 4.86X10^10 answer

Answer 25

i know for the one's digit, it will be the product of the 2 one's digits of the 2 numbers
6*8 = 48
so 8

Answer 26

A developer has land that has x feet of lake frontage. The land is to be subdivided into lots, each of which is to have either 80 feet or 100 feet of lake frontage. If 1/9 of the lots are to have 80 feet of frontage each and the remaining 40 lots are to have 100 feet of frontage each, waht is the value of x?

Answer 27

hold on a sec, i'll brb

Answer 28

ok

Answer 29

alright
before you can find x, you need to know how many lots there are
Let N be num of lots
(1/9)N = N -40
N - (1/9)N = 40
8/9N = 40
N = 45

(1/9)*45 = 5
So 5 lots had 80ft, 40 had 100ft
x = (5*80)+ (40*100)

Answer 30

ok

Answer 31

were you able to follow that?

Answer 32

a lil...what i did i got up to the 8/9x=40 but how did you get 45

Answer 33

oh i got it

Answer 34

oh multiply by reciprocal

Answer 35

u need hundred metals..lol thanks

Answer 36

haha thanks
i didn't have to take the gre, is it a long test

Answer 37

how did you get (1/9)N = N -40

Answer 38

i kno im going back to soph junior yr math it sucks

Answer 39

um i got it from the statement "the remaining 40 lots"
this implied that total lots(N) = (1/9)N + 40

Answer 40

ok i got that

Answer 41

yeah i dunno why i just didn't write it that way lol

Answer 42

no i meant n-(1/9)n=40

Answer 43

o i got it

Answer 44

its all the same equation, just different ways of writing it
..thats algebra, rewriting equations

Answer 45

ok

Answer 46

much thanks my test is tomorrow at 130...wish me luck..

Answer 47

good luck

Answer 48

Ray is 2 inch taller than Lin, and Ray is 3 inch taller than Sam.
What is the average height of ray, Lin and Sam? The median height of Ray, Lin and Sam?

Answer 49

@ dumbcow...i think your answer to...
if x and y are the tens digit and the units digit, respectively, of the product 725,278x67,066, what is the value of x+y? ...is wrong...
...it should be more like the answers on the yahoo link...
It's kind of a trick question. You don't have to multiply a 6 digit number by a 5 digit number. If you do, you get 48641494348, and then take 4 + 8 to get 12
https://answers.yahoo.com/question/index?qid=20130603214107AAkY8t2