# Let's think by balance calculation 4 ~ Let's think about balance ~

Last time, we talked about "Let's think about balance calculation 3 ~ Let's think about balance ~".

Now that you have an image of a balance, let's set it up.

Let's think about the amount of B and the concentration of C with unknowns.

Here, the "difference between the concentration of C and 11%" is an unknown number.

e?why?
Isn't the concentration of C unknown?

Still good, but"Because the calculation is easier" if "the difference is unknown".

The latter conditions are as follows.

From here, let's balance and formulate.

The balance between the left side and the right side of the fulcrum is "weight x length (distance from the fulcrum)".

Certainly, it is better to set the difference between the concentration of C and 11% as an unknown number.
It's easy to calculate.

Since two conditional expressions have appeared for the two unknowns, they can be solved.

I just solve this formula, but in such a case"Isn't there the same thing?"Let's think.

If you have the same thing, the calculation is easy.

If you pull around, the same thing disappears.

The amount of B and the concentration of C have been obtained.

It's convenient to calculate the balance.

It's fun because you can solve it and imagine it.

"Arithmetic to junior high school" is considered from an equational point of view.

If you can do it from both perspectives, your "multi-faceted view" will expand.It will be.

Formulating only with equations tends to complicate the calculation.

At the time of the test, if you solve a complicated calculation formula, you may make a mistake.

Try to be as "easy to calculate" as possible.

To do that,It is important to "think from multiple perspectives" on a daily basis.

Finally, I introduced how to solve the balance calculation, which is different from the article, but it is not an objection to the author's idea.

This is an introduction that says, "You can think like this."

The article presents a multifaceted perspective, and I have a lot of respect for the authors who think and write.