Question 421277
Let {{{x}}} = number of students in 1981
Let {{{y}}} = number of teachers in 1981
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given:
{{{x/y = 13/1}}
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{{{ x = 13y }}}
In 1991:
{{{ (x + .373x) / (y + .206y) }}}
{{{ ( 1.373*13y) / ( 1.206y ) }}}
{{{ 17.849y / (1.206y) }}}
{{{ 17.849/1.206 = 14.8 }}}
15/1 student/teacher ratio
right you are!