CONSTRAINTS HELP!

Mr. Weber drives to a landscape supply center to buy sand and gravel. The center has 6 lb of sand and 13 lb of gravel in stock. Mr. Weber needs at least 2 lb of sand. The amount of gravel he will buy will be at least twice the amount of sand he will buy.

Mr. Weber buys 7 lb of gravel. How much sand can he buy?

Choose all answers that are correct.
(Points : 1)
A 2 lb
B 3 lb
C 4 lb
D 5 lb
E 6 lb

Question

CONSTRAINTS HELP!

Mr. Weber drives to a landscape supply center to buy sand and gravel. The center has 6 lb of sand and 13 lb of gravel in stock. Mr. Weber needs at least 2 lb of sand. The amount of gravel he will buy will be at least twice the amount of sand he will buy.

Mr. Weber buys 7 lb of gravel. How much sand can he buy?

Choose all answers that are correct. 
(Points : 1)
    A    2 lb 
    B   3 lb 
    C    4 lb 
    D    5 lb 
     E   6 lb

stefrheart · Answer

Well first can you have negative numbers as answers?

anonymous · Answer

No. The answers listed are the only answers. None are negative.

stefrheart · Answer

Then two restraints are $$y \ge 0 and x \ge 0$$

anonymous · Answer

So what would the answer be? I assume there are 1+ considering it allows me to check off multiple boxes.

stefrheart · Answer

Did you get all the constraints?

anonymous · Answer

Are the answers B & C? B. 3LB and C. 4LB?

anonymous · Answer

@haileyalexander No it can't be C. Would you like help?

anonymous · Answer

I just need letter answers, sorry for the confusion. This is the last question on my homework and I have trouble with it.

anonymous · Answer

Oh I understand, I am just wondering if you want me to help you since I am bit confused at what stefrheart is saying

anonymous · Answer

I am a little as well, lol. But yes, I greatly appreciate anybody's help as I desperately need the answer(s).

anonymous · Answer

ok well let me take a shot at this so given the fact that Mr. Weber has bought 7lbs of gravel,  and that he must buy atleast twice the amount of gravel as compared to sand. How much sand should he buy?

anonymous · Answer

2 to 3 pounds of sand, correct?

anonymous · Answer

yup or 1 actually but... why can't he buy 1lb?

anonymous · Answer

No idea, that isn't an answer. So... The answer choices on this question are A & B? I had no idea why 4 lb was one of my choices, lol.

anonymous · Answer

haha it's says in the problem that he must buy atleast 2lbs. And the part of the problem that says: "The center has 6 lb of sand and 13 lb of gravel in stock" means that he cannot buy more than 6 lbs. But that's all extra info, you are correct, the answer is A & B!

anonymous · Answer

Jeez, my fault! Lol, thank you for the help. You broke it down easy enough for me. I appreciate it. :)

anonymous · Answer

no problem good luck on your homework.