anonymous
  • anonymous
is there a technique on solving word problem in age of a person, time consumed in x activity, or any other? im having a hard time solving them during exam while time is so limited
Mathematics
chestercat
  • chestercat
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arindameducationusc
  • arindameducationusc
is it some kind of linear equation problem?
anonymous
  • anonymous
example a man is 3x as old as his son.4years ago he was 4x as old as his son. how old is his son?
UnkleRhaukus
  • UnkleRhaukus
you could start by changing some of the words to letters [a man is 3x as old as his son] becomes m = 3s

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arindameducationusc
  • arindameducationusc
3x+4=4x
arindameducationusc
  • arindameducationusc
see, link the current with the old.
anonymous
  • anonymous
is it really 3x+4=4x? if thats the equation so x=4 and if son is 4years old then 4years ago he was 0
anonymous
  • anonymous
i guess the right equation is 3x-4 = 4(x-4) while x is the age of son. man is 36 4years ago 32 son is 12 4years ago 8
arindameducationusc
  • arindameducationusc
if x=4 then its the son's age. Man's age is 3x, which is 3*4=12 But let me check... wait....
arindameducationusc
  • arindameducationusc
ya this should be the answer.....
arindameducationusc
  • arindameducationusc
In your equation how did you put4(x-4) ? Just tell me why
anonymous
  • anonymous
3x-4 is the age of man 4years ago 4(x-4) 4years ago the age of son is 4x as the man
anonymous
  • anonymous
-4 since its past
arindameducationusc
  • arindameducationusc
O ho.... see....3x is the man's age. 4x is the age 4 years before. 3x-4 means the age minus 4 years which gives the previous age which is 4x so, 3x-4=4x.. when you find x, you get the son's age... Got it @darkmaker ?
anonymous
  • anonymous
3x-4=4x -4=4x-3x -4=x since there is no negative age x is equal to 4 if x=4 son is 4 4years ago 0 man is 12 4years ago 8 equation seems wrong age of man is 4x as age of son 4years ago the age of son must be reduced by 4 also since it was 4years ago anyway I browse the last page of the book and there is the correct answer there son is 12 years old =)
arindameducationusc
  • arindameducationusc
okay good for you then... hmmm let me think where I made the mistake. Thanks for the answer anyways.......
arindameducationusc
  • arindameducationusc
I got it... You are right......... Good job! @darkmaker
anonymous
  • anonymous
ill guess im gonna ask my professor regarding my question here. thanks anyway =)

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