Mary has 25 pencils but gives x pencils to her friends. Number of pencils that she has left is represented by

x-25, x+25, 25-x, or 25/x

Mary is giving away pencils so it's a subtraction question

Lets say that X is 5
then the answer would be: 25 - 5 = 20

Lets say that X is 7
then the answer would b: 25 - 7 = 18

Because we dont know what X is, we write it as 25 - X

See, it can't be any other answer. Next time you see a problem like that, just imagine X is a number and then look at it that way.

I'm glad it helped! :) good luck with the rest of your questions. Feel free to message me if u have any more like this and I will try to explain it for u

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If Mary gives x pencils to her friends, then x pencils are taken away from her. So x is obviously smaller than 25. Whenever you subtract numbers, always put the smaller number after the - sign.
25 - x is the answer as u are taking x away from 25.

The number of pencils Mary has left is represented by: 25 - x

She has 25 and gives an unknown number (x) to her friends She has less pencils now, so therefore it would be subtraction.

Mary has 25 pencils but gives x pencils to her friends.
Number of pencils that she is left with is represented by?
Answer choice is 25 - x.

25= total number of pencils
x= number of pencils given to her friends
So, it is x-25.

25-x

her original pencils, (25), minus those she gave away (- X)

25-x

25. She only gave X. Her friends now have X.

Ergo, Mary still has 25 pencils.

25-x


~ easy algebra

25 - x

25-x

25-x

25 -x ....

25-x

Mary now has 25-x pencils.

25-x i think

im pretty sure its 25-x