Question 881016
Let {{{ x }}} = his total income
given:
{{{ x = (1/4)*x + (1/5)*x + 231 }}}
{{{ x - (1/4)*x - (1/5)*x = 231 }}}
Multiply both sides by {{{ 20/x }}}
{{{ 20 - 5 - 4 = 4620/x }}}
{{{ 11 = 4620/x }}}
{{{ x = 4620/11 }}}
{{{ x = 420 }}}
Rs. 420
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check:
{{{ x = (1/4)*x + (1/5)*x + 231 }}}
{{{ 420 = (1/4)*420 + (1/5)*420 + 231 }}}
{{{ 420 = 105 + 84 + 231 }}}
{{{ 420 = 420 }}}
OK