I would write the missing variable as x. It's what everyone uses.
Anyway, 91 divided by x is 65.
The way we can do this is reverse 65 and x.
91 divided by 65 = x.
91 divided by 1.4 = 65
65 x 1.4 = 91
x (or ?) = 1.4
Divide the numerator of the fraction by the denominator. the first two digits of the decimal is the percentage
C ⠀ ⠀ ⠀ ⠀ ⠀
The points between 0 and 1 increase in increments of 1/6th
57 m/h or mph
171 divided by 3 is 57
