n is equal to how many thirds of seven?
A.1/3
B.1
C.3
D.7
E.21
答案：C
many positive integers less than 20 are equal to the sum of a positive multiple of 3 and a positive multiple of 4?
A.2
B.5
C.7
D.10
E.19
答案：D
figure above consists of 25 squares. If the figure were folded along the dotted diagonal to forn a flat triangle, then 26 minus the number in the square that would coincide with the square containing 26 would be
A.13
B.14
C.15
D.16
E.17
答案：D
is the remainder when 63 is divided by 8?
A.5
B.3()
C.2
D.1
E.0
答案：E
