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fernandochang

别笑我..........我是个标准的数学白痴.............

6. In a certain packinghouse, grapefruit are packed in bags and the bags are packed in cases. How many grapefruit are in each case that is packed?
(1)The grapefruit are always packed 5 to a bag and the bags are always packed to a case.
(2)Each case is always 80 percent full.
A):A         

7. If a, b, and c are integers, is the number 3(a+b)+c divisible by 3?
(1)a+b is divisible by 3.
(2)c is divisible by 3.
A):B         

8.What fractional part of the total surface area of cube C is red?
(1)Each of 3 faces of C is exactly 1/2 red.
(2)Each of 3 faces of C is entirely white.
A):C   

9.If y ≠ 0 and y ≠ -1, which is greater, x/y or x/y+1 ?
(1) x≠0
(2)x > y
A):E

10. Each person on a committee with 40 members voted for exactly one of 3 candidates, F, G, or H. Did Candidate F receive the most votes from the 40 votes cast?
(1)Candidate F received 11 of the votes.
(2)Candidate H received 14 of the votes.
A):A  

11.S is a set of integers such that
  i) if a is in S, then –a is in S, and
  ii)if each of a and b is in S, then ab is in S.       Is –4 in S ?
(1)1 is in S.
(2)2 is in S.
A):B     

12.IF the area of triangle region RST is 26m what is the perimeter of RST?
(1)The length of one side RST is 5√2.
(2)RST is a right isosceles triangle.
A):B