Question 461464

let's number of students be {{{x}}}:

{{{63 = (90/100)x}}} ....solve for {{{x}}}

{{{63 = (9cross(0)/10cross(0))x}}}

{{{63 = (9/10)x}}}

{{{63*10 = 9x}}}

{{{630 = 9x}}}

{{{630/9 = x}}}

{{{70 = x}}}.....a number of students