<PRE><B>Question 733758</B>
Let {{{ a }}} = the present age of the owner
Let {{{ b }}} = the present age of the mouse
given:
(1) {{{ a + b = 13 }}}
(2) {{{ b + 3 = a - 4 }}}
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(2) {{{ a - b = 7 }}}
(1) {{{ a + b = 13 }}}
Add the equations
{{{ 2a = 20 }}}
{{{ a = 10 }}}
and
(1) {{{ 10 + b = 13 }}}
(1) {{{ b = 3 }}}
The owner is 10 and the mouse is 3
check:
In 3 yrs the mouse is 6
4 yrs ago the owner was 6
OK
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