I got question like this maybe some math question in japanese

179からある数これを引いたら、残りは12になりました。ある数はいくつですか。

Suppose x is the number that the question ask  
First i thought like x - 179=12  
Somewhat confuse with'これを引いたら’  
Is this mean there is a number and it is substracted by 179 or the number
itself 179??  
Particle を makes 179 like an object..  
Its ambiguous for me But the correct one is 179-x=12?
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english-to-japanese mathematics academic-japanese
Problem in understanding math problem in japanese
> 179 からある数これを引いたら、残りは12。数字はいくらですか

As narto said in his comment the above sentence or the math problem is very
clumsy and almost ungrammatical.

I would edit the math problem like:

> 179からある数を引いたら、残りは12になりました。ある数はいくつですか。

179 - X = 12

This teacher has to learn Japanese before they try to start teaching math!
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Let me see. "179 からある数これを引いたら、残りは12。数字はいくらですか". Let7s translate, saving word
order.

"179 from some number this subtract, rest is 12. number what is." - Dirty
translation. "this" is grammatical error, delete it.

Let's fix word order, add IF we. "If we subtract some number from 179, rest is
12. What number?"

Now to math part :). 179 - somenumber = 12 => somenumber = 179 - 12 = 167.
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Hmm . . . let's see. It may well be that これ is a typo or an imperfect
recollection, but if I had to mount a defence of it, my argument would go like
this: in circumstances where it is essential that a text such as a law, for
example, should be absolutely unambiguous, it is common to recapitulate
subject or object with これ so as to be quite clear, even though the same
passage without これ would be regarded as acceptable in ordinary expository
prose. There are numerous examples, for instance, in the Japanese
Constitution. Here are a couple of reasonably straightforward ones:

前項の目的を達するため、陸海空軍その他の戦力は、これを保守しない

In order to achieve the object of the preceding section, an army, navy and air
force and other war potential - we will not maintain these.

国の交戦権は、これをを認めない

The right of the state to engage in warfare - we will not recognise this

(Official,translation: In order to accomplish the aim of the preceding
paragraph, land, sea and air forces, as well as other war potential, will
never be maintained. The right of belligerency of the state will not be
recognised.)

The same convention is used in language textbooks to make clear the structures
of sentences in other languages.

If it is used in maths problems as well, which would seem likely, I would
interpret 179からある数これを引いたら、残りは12になりました。ある数はいくつですか。 as: A certain number, if you
deduct this from 179, gives a remainder of 12. How much is this certain
number?
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