Question 962903
{{{(number of boys)/(number of pupils)}}} = 60% = {{{60/100}}}
{{{(number of boys)/(650)}}} = {{{60/100}}}
Let n = number of boys
{{{(n)/(650)}}} = {{{60/100}}}
do cross products
100*n = 60*650
100n = 39000
divide each side by 100
n = 390
So we have 390 boys