# simple equations ( math)

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Share \$100 between Joseph and Peter so that Joseph has 3 times as much as Peter.

• simple equations ( math) -

Let x = the amount of money that Peter has. Now try to set up the equation to solve for x.

• simple equations ( math) -

sorry i don't understand

• simple equations ( math) -

You want to solve for the amount of money that Peter has. So you let your variable equal that amount of money.

Now, you know that Peter's money + Joseph's money = \$100.

Can you express the amount of money Joseph has in terms of x, the amount of money Peter has?

• simple equations ( math) -

so altogether the have \$100. Joseph has 3 time more then Peter. would joseph have \$75 and Peter have \$15 ?

• simple equations ( math) -

I believe you mean that Peter has \$25, which would be correct.

Could you write the equation you used to solve that?

• simple equations ( math) -

ohyes sorry i meant that.
3/4 of 100 is 75
so the rest is 25

• simple equations ( math) -

Again, where is your variable (x) in the equation?

You should have an equation that looks like the following:

"Peter's money + Joseph's money = \$100"
x + J(x) = \$100

where J(x) is a (simple) function expressing Joseph's money in terms of x.

The reason I ask is not to make it hard now, but because you will encounter problems that cannot be solved mentally - multiple variable problems, for example. You will need to be able to set up an equation from the word problem.

• simple equations ( math) -

Oh. ook ... thank you for your help

• simple equations ( math) -

alex spent 3/7 of his money. he give 1/4 of the reminder to his sister. he had \$120
left. how much money did he have in the begining

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