How do you find what number is 1/3 of 25 or 1/3x=25?

2009-04-01 3:18 pm
I'm really having a hard time with math, I want to quit but I would be stupid for me not to try and understand. Thanks

回答 (14)

2009-04-01 3:22 pm
✔ 最佳答案
(1/3)x = 25
3*(1/3)x = 25(3)
x = 75
2009-04-01 10:46 pm
= 1/3(25)
= 25/3 or 8 1/3

Answer: 8 1/3 or 8.33 1/3 is 1/3 of 25

The other expression is different from 1/3 of 25, the expression requires to find the number where its 1/3 is 25 or question: What is the number whose 1/3 is 25?:
1/3x = 25
x = 3(25)
x = 75

Answer: 75 is the number whose 1/3 is 25.
2009-04-01 10:23 pm
Just do 25/3.

Answer: 8 1/3
2009-04-01 10:55 pm
1)
1/3 x 25
= 25/3

2)
1/3(x) = 25
x/3 = 25
x = 3(25)
x = 75
2009-04-01 10:44 pm
First off, note that you wrote TWO questions:
      x = ⅓ of 25
and
      ⅓ of x = 25
so don't be confused when you get two different answers.
-----
Hint: When you don't remember how to solve a problem, try solving a really simple example, preferably one that you already know the answer to, such as

      ½ of 2 = ?

You don't need to do any calculating to know that half of 2 is 1. But once you look at the solution

      ½ of 2 = 1

you can see that "of" just means "times."
      ½ of 2 = ½ ∙ 2
               = 1

Apply this to your problems.
x = ⅓ of 25
   = ⅓ ∙ 25
   = 8⅓

⅓ of x = 25
⅓ · x = 25
multiply both sides of the equation by 3
3 ∙ ⅓ ∙ x = 25 ∙ 3
x = 75
2009-04-01 10:33 pm
A number that is 1/3(one third)of 25 means a number when multiplied by 3 gives 25. So to find the number you divide 25 by 3.ie 25/3=8+1/3
Therefore the number that is 1/3 of 25 is 8+1/3
2009-04-01 10:32 pm
Ryan is correct. Divide both sides of the equation by 1/3, or, easier, multiply them by 3. (same thing). so:

1/3x =25
x = 75 (1/3 * 3 = 1, 15 * 3 = 75)
2009-04-01 10:24 pm
multiply 25 by the reciprocal of 1/3

25(3/1) = X

25(3) = 75

This is the same as dividing 25 by 1/3.
2009-04-01 10:24 pm
25/3 so how many 3s make 25

8 r 1 so 8 1/3 or 8.3333333333
2009-04-01 10:23 pm
1/3 of 25:
1/3 * 25 = x
25/3 = x = 8+1/3


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