Question

by what number should -3/4 be multiplied so that the product become 2/3

Answer 1

let the number = y
so, 
number x (-3/4) = 2/3

         y  x  (-3/4)  =  2/3
                  
                    y  =  2/3 divided by (-3/4)
                        =   2/3  x  (-4/3)
                        =  -8 / 9
so, the number = -8/9