Writing equations

Question

9 divided be what equals 16

 

Answer 1

Let x = the what

 

Translate:

"9 divided by what equals 16"

  9      /       x          =     16

 

 9 = 16x                       [multiply both sides by x]

 9/16 = x                     [divide both sides by 16]

 

9 divided by (9/16)  equals 16.

 

Check:

     Does    9 / (9/16)   =   16    ?

                9 * (16/9)  =  16   ?              [to divide by fraction, invert and multiply]

                    16    =   16   ?yes

Answer 2

9/x = 16

 

Solve for x.

 

Can you finish from here?