Question 1117366
You have to put everything in terms of
either months or years.
I will put everything in terms of years
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{{{ 10 }}} months = {{{ 10/12 }}} years
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Let {{{ a }}} = Paula's age now
Let {{{ b }}} = Janice's age now
Let {{{ c }}} = Jean's age now
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(1) {{{ a + 5 = 15 }}}
(2) {{{ b = a + 3 }}}
(3) {{{ b = c - 10/12 }}}
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(1) {{{ a = 10 }}}
Plug (1) into (2)
(2) {{{ b = 10 + 3 }}}
(2) {{{ b = 13 }}}
and
(3) {{{ 13 = c - 10/12 }}}
(3) {{{ c = 13 + 10/12 }}}
and
{{{ c + 3 = 16 + 10/12 }}}
In 3 years, Jean will be 16 yrs 10 mo old