I tried it like five different ways that I’ve learned, and none of them worked.

But in the equations that other people posted I’m not quite getting how 7/8-3/4=160….

I set it up as :

3/4(x-160)=1/8x

But it didn’t work…

I agree, it’s too hard for a 9 year old, especially if they didn’t teach him how to do it…

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I just read through the two above me and I don’t think either of them realized that it’s supposed to be 3/4 of the remaining money, not that he spent 3/4 of the total money. How else would he have 1/8 left?

Hi, whether you’re 9 or 19, these questions can be a little tricky to set up. In these kinds of problems we are looking to find a variable (an unknown) usually marked by the letter “x”. Then you explain to your brother that in order to solve for “x” we need to set up an equation. Having said these, let’s take a look at your question:

Denis was left at the end with 1/8 of his money We want to see how much he had spent. . (8/8 X) is the same as one X. we use the expression 8/8 instead of the number 1 because 8 divided by 8 is 1 and it just helps us in solving the fraction. That means if “x” was all his money, he must have spent 7/8 of it to be left with 1/8 or mathematically 8/8X-1/8X = 7/8X

7/8X is going to be the left portion of our equation.. Great.. We are half way done. Now comes the part that needs a little practice to get it easier. We need to express the 7/8 in a mathematical way meaning. What is this 7/8 in term of ‘x’ and numbers.

We know 2 things:

1) he spent $160 on food so we have on the right side of the equation the value “160”

2) Also on the right side of the equation we say that if the variable “X” is all his money, then he spent ¾ of it, which means he spent ¾ x

Knowing these 2 facts we can now build our equation which is the following:

7/8 X = 160 + ¾ X

To solve for “X” in this equation you moved the X variables to the left of the = and the numbers on the right, so re-write this equation as: (don’t forge to change the signs when moving from one side of the equation to the other 🙂

7/8X – ¾ X = 160

If you multiply ¾ by 2/2 which is 1 and doesn’t change the value any, it just makes the fraction subtraction easier you will get:

7/8X -6/8X =160

This gives you

1/8X =160

Finally multiplying 160 with 8 with give you the answer.

X = 160*8

X= 1280

Your teacher might be a little tough, most math teachers are so don’t forget to put the unit for 1280 which is in dollars $. So your answer is

$1280

Good luck to you and your brother 🙂

The amount of money he spent: 1-1/8=7/8

How much in fraction is $160 in the money he spent: 7/8-3/4=$160

7/8-6/8=$160

1/8=$160

$160 divide 1/8= $160*8=$1280

So the answer is $1280.

No, it’s easy for a 9 year old. Well, it is in my country.

14 + 12 + 5 = 31 so 2 scholars are wearing the two a) 14+12-2 = 24 b) 14-2 = 12 c) 12-2 = 10 Please word that alot of persons will answer 26 for the 1st question, even though it fairly is incorrect: 29 – 5 = 24 (minus of persons who arent wearing pink OR blue 14+12 = 26 there is 26 blue and pink colorations yet basically 24 scholars this suggests 2 human beings must be wearing the two colorations as I merely reported there is basically 24 human beings so what proportion pink and blue = 24 pink no longer blue = pink human beings much less the folk who wearing the two blue no longer pink = blue human beings much less the folk who wearing the two

Dude, I’m not even doing that and I’m 13.

I know, I’m extremely stupid with math.