Question 1103210
Let {{{ n }}} = the number of pigs he bought
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{{{ 10*( n - 7 ) = 150 }}}
{{{ n - 7 = 15 }}}
{{{ n = 22 }}}
He originally bought 22 pigs
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check:
{{{ ( 290 + 150 ) / 22 = 440/22 }}}
{{{ 440/22 = 20 }}} buying price/pig
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{{{ 10 + 20 = 30 }}} selling price per pig
{{{ 30*15 = 450 }}}
and
{{{ 450 - 440 = 10 }}} profit/pig