Question 1121210
If you label their ages {{{ a }}}, {{{ b }}}, and {{{ c }}}
{{{ a - b = 1 + 9/12 }}}
{{{ c - b = 2 + 8/12 }}}
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Find {{{ a - c }}}
{{{ a = b + 1 + 9/12 }}}
{{{ c = b + 2 + 8\12 }}}
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{{{ a - c = b + 1 + 9/12 - b - 2 - 8/12 }}}
{{{ a - c = -1 + 1/12 }}}
{{{ a - c = -11/12 }}}
Abi is 11 months younger than Cam
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Note that if you multiply both sides by {{{ -1 }}}
{{{ -a + c = 11/12 }}}
{{{ c - a = 11/12 }}}
This shows that Cam is older and Abi is younger