Math Is Fun Forum

gmleiva68

Guest

Help with these three problems

1-A chemist has two solutions of sulfuric acid. One is 42% solution, and the other is a 65% solution. How many liters of each does the chemist mix to get 15 liters of 55% solution?

2-An after shave lotion is 40% alcohol. If you have 10 fluid ounces of the lotion, how much water must be added to reduce the mixture to 35% alcohol?

3- If a set has 32 elements, how many subsets does it have?

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Help with these three problems

Hi gmleiva68;

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

gmleiva68

Guest

Re: Help with these three problems

Thanks for your answer.

I am trying to solve these problems by myself. Give me more time.

gmleiva68

Guest

Re: Help with these three problems

Hi gmleiva68;

Therefore:
32=2^n
32=2^5
5 subsets?

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Help with these three problems

Hi;

Give me more time.

Of course, you have as much time as you need. Unless you are as old as I am. Then I would advise that you really hurry.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

gmleiva68

Guest

Re: Help with these three problems

Hi gmleiva68;

Therefore:
32=2^n
32=2^5
5 subsets?

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Help with these three problems

Hi;

If the set has 32 elements and the number of subsets of a set with n elements is 2^n.

Then n = 32 and the number of subsets is 2^32.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

gmleiva68

Guest

Re: Help with these three problems

Thanks Bobby

Can you check my answers for problems 1 and 2, please?

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Help with these three problems

Hi;

Where are they?

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

gmleiva68

Guest

Re: Help with these three problems

I answered them under your reply.

These were my results

Problem 1= 6.52
problem 2=1.42

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Help with these three problems

Hi gmleiva68;

Problem 1 is fine:

Problem 2, if you are going to round to 2 decimals like that then 1.43 is a better answer.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

gmleiva68

Guest

Re: Help with these three problems

Thanks you!!!

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Help with these three problems

Hi;

#3 is basically is just plugging in. Did you understand what I did for 1 and 2?

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

gmleiva68

Guest

Re: Help with these three problems

YES. I understood the procedures.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Help with these three problems

Okay then I will retire back to the black lagoon where I reside. Safe in the knowledge that the Amazon basin is as of yet truly unexplored.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.