Question 1130625
Let {{{ x }}} = the number of nephews who
were bought a CD
{{{ 10 - x }}} = the number who were bought a video
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{{{ 16.88x + 14.95*( 10 - x ) = 161.08 }}}
{{{ 16.88x + 149.5 - 14.95x = 161.08 }}}
{{{ 1.93x = 11.58 }}}
{{{ x = 6 }}} 
also:
{{{ 10 - x = 4 }}}
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She bought 6 CDs and 4 videos
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check:
{{{ 16.88x + 14.95*( 10 - x ) = 161.08 }}}
{{{ 16.88*6 + 14.95*4 = 161.08 }}}
{{{ 101.28 + 59.8 = 161.08 }}}
{{{ 161.08 = 161.08 }}}
OK