Question 1153378
Let {{{ x }}} = number of white ribbons
{{{ x + 2 }}} = number of red ribbons
{{{ x - 1 }}} = number of blue ribbons
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{{{ x + ( x + 2 ) + ( x - 1 ) = 37 }}}
{{{ 2x + 2 + x - 1 = 37 }}}
{{{ 3x + 1 = 37 }}}
{{{ 3x = 36 }}}
{{{ x = 12 }}}
and
{{{ x + 2 = 14 }}}
{{{ x - 1 = 11 }}}
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12 white ribbons
14 red ribbons
11 blue ribbons
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check:
{{{ 12 + 14 + 11 = 37 }}}
{{{ 37 = 37 }}}
OK