Question 669962
D = J+3
J-3 = 6 + {{{1/4}}}D
...
J-3 = 6 + {{{1/4}}}(J+3)
J-3 = 6 + {{{1/4J + 3/4}}}
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J - {{{1/4}}}J = 6 + {{{3/4}}} + 3
{{{3/4}}}J = 9 + {{{3/4}}}
{{{3/4}}}J = {{{39/4}}}
J = {{{(39/4)(4/3)}}}
{{{highlight_green(J = 13)}}} years old
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D = 13 + 3
{{{highlight_green(D = 16)}}} years old
...
Check
13 - 3 = 10
6 + {{{1/4}}}(16) = 10
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