Question 1152275
Let {{{ x }}} = the revenue for Nintendo
{{{ x + 12 }}} = the revenue for Sony
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{{{ x + ( x + 12 ) = 54 }}}
{{{ 2x + 12 = 54 }}}
{{{ 2x = 42 }}}
{{{ x = 21 }}}
Nintendo's revenue was $21 billion
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check:
{{{ x = 21 }}}
{{{ x + 12 =33 }}}
{{{ x + ( x + 12 ) = 54 }}}
{{{ 21 + 33 = 54 }}}
{{{ 54 = 54 }}}
OK