GMAT PREP Quan #15

[li.maor]

hello
I can not find a place where full explanation is given to the GMAT PREP exam, please help me with the following:



thank you
-L

[bineeshnair4u]

1) Taking addition 1st a+b = b+a (true)
taking multiplication a*b = b*a (true)
Cannot say whether the operation is addition or multiplication.
2) Taking addition Left Hand Side = a+b-c
Right Hand Side = a+b-a-c = b-c (false)
Taking multiplication LHS = a*(b-c) = ab - ac = RHS
If the equation has to be true then operation must be multiplication.

I will go with answer B

What is the official anwer?

[li.maor]

Hi thanks!
B indeed. seems very easy when you put it like that- dont know what made me fail this one

will challange with some more..
-L

[bineeshnair4u]

you are welcome

[RonPurewal]

yep, nice solution.

[bineeshnair4u]

Thanks Ron. I am your fan .. The way you tackle problem is amazing... :D:D:D

[RonPurewal]

Thanks Ron. I am your fan .. The way you tackle problem is amazing... :D:D:D

thanks ... but i'm not even the one who solved the problem in this thread!