Question 459136
Let {{{j}}} = Jeffery's age now
Let {{{m}}} = Michael's age now
Three years ago Jeffery was {{{ j-3 }}}
In nine years Jeffery will be {{{ j + 9 }}}
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given:
(1) {{{ j - 3 = 2m }}}
(2) {{{ j + 9 = 4m }}}
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From (1):
(1) {{{ j = 2m + 3 }}}
Substitute this in (2)
(2) {{{ 2m + 3 + 9 = 4m }}}
(2) {{{ 2m = 12 }}}
{{{ m = 6 }}}
and
(1) {{{ j = 2m + 3 }}}
(2) {{{ j = 2*6 + 3 }}}
{{{ j = 15 }}}
Michael is 6 and Jeffery is 15