Question 437868
Let {{{b}}} = voltage of 2nd battery
{{{2b}}} = voltage the 1st battery
{{{ 3*(2b) = 6b }}} = voltage of 3rd battery
{{{ b + 2b + 6b = 54 }}}
{{{ 9b = 54 }}}
{{{ b = 6 }}}
{{{ 2b = 12 }}}
{{{ 6b = 36 }}}
The batteries are 
6v, 12v, and 36v