Math expression in HW bank

[Mymisc]

Instructor,

This is from HW bank. The answer given is (E). I now wonder can't (C) also be interpreted as the statement says, or how a statement would be like to desc (C)?

Thanks


"Ten subtracted from seven times a number is five more than that number."
(10 - 7)n = n + 5
7n = 10(n + 5)
(7 - 10)n = n + 5
10 - 7n = n + 5
7n - 10 = n + 5

[gokul_nair1984]

Ten subtracted from seven times a number is five more than that number.

(10 - 7)n = n + 5
7n = 10(n + 5)
(7 - 10)n = n + 5
10 - 7n = n + 5
7n - 10 = n + 5

First address the portion in bolded;let the original number be n
Therefore, 7 times the number is 7n

Going forward, the question says thay you've got to subtract 10 from it.
Therefore, 7n-10---(1)

Furthermore, (1) is given to be equal to five more than the original number(n)

=>7n-10=n+5( Hence option E)

[Mymisc]

I tried to say that the original can be interpreted in two ways, wh y the 1st one is chosen? And what is the expression if we meant: (7 - 10)n = n + 5?

Ten subtracted from seven times a number is five more than that number, or

Ten subtracted from seven times a number is five more than that number

[gokul_nair1984]

You need to clear your concepts on BODMAS/ PEMDAS. The order of execution is Brackets of Division multiplication addition subtraction.

Ten subtracted from seven times a number is five more than that number

So here, the aforementioned option is chosen.

And what is the expression if we meant: (7 - 10)n = n + 5?

-3 times a number is 5 more than the number.

[Mymisc]

Thank you gokul_nair1984. I don't think I am stuck'd with BODMAS/ PEMDAS. I am confused with English language.

Instructor, I don't think I am convinced that the BODMAS/ PEMDAS rule should also be applied on English expression, but only on Math expression, aren't they?

Thanks!

[gokul_nair1984]

Instructor, I don't think I am convinced that the BODMAS/ PEMDAS rule should also be applied on English expression, but only on Math expression, aren't they?

Not True..

BODMAS is a defined rule for all executions. It has to be used in all situations(Directly where mathematics is involved and indirectly when english language has to be interpreted in mathematical terms)

[tim]

mymisc, this IS math. just because it's written using words doesn't change the fact that there are rules that must be applied. we all know that 2+2=4, but does it totally lose its meaning when i write it as "two plus two equals four"?