Another approach could be you need 200 cans of 6oz juice meaning 1200 oz, which is same as 100 cans. (1 can = 12 oz).

Now in 4 cans of juice you have 1:3 ratio of concentrate to water. Therefore in 100 cans you will have 25:75 ratio. Hence A.

This is GMAT Prep question. I was also going with B. However the OA is E. Also as Ian mentioned there was a typo which I have fixed.

Thanks Ian, I understand your explanation. My reasoning was that 4 different prime numbers means 2x3x5x7 I did not think that they can appear twice.

90 copies of book

Store S sold a total of 90 copies of a certainb book during the seven days of last week. Different number each day. Greatest number of copies on Sat and second greatest on Fri. Did store sell more than 11 books on Friday?

1. 8 copies were sold on Thurs
2. 38 copies were sold on Sat

Yes I read the OG explanation, wanted to see if someone had a simpler version

IMO E,

and is not necessary. so C. D. E.

shorten is better than lessen, lessen is for something which you cannot count. Meaning lessen the amount of milk in coffee etc. So C & E.

seven days rather than fourteen makes more sense. So E.

I am not sure I understand your logic. I don't think sqrt(x^4 + y^4) is same as x^2+y^2.

Yes the right answer is B between 3 to 6, but I am not sure how. Because if you take 4 4^4 is above 100.

However if you take x as 3.1, then x^4 = 92.351 which is still less than 100, and then y can taka a value such that y^4 added to x^4 can be 100. May be that is why the answer is B.