Math Is Fun Forum

The first problem looks like this:

   4< (sq root symbol) x <9 is equivalent to saying what about x? 

a. 0 < x < 5
b. 0 < x < 65
c. 2 < x < 3
d. 4 < x < 9
e. 16 < x < 81

(what is this symbol: < ) ???

second problem:

If the total cost of x apples is b cents, what is a general formula for the cost, in cents, of y apples?

a. b/xy
b. x/by
c. xy/b
d. by/x
e. bx/y

Third problem:

75% of a class took at least 8 math courses, Of the remaining class members, 60% had taken 6 or 7 math courses. What percent had taken fewer than 6 math courses?