Question 888291
Let {{{ a }}} = Abu's age now
Let {{{ m }}} = his mother's age now
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(1) {{{ m = 3a }}}
(2) {{{ a + 5 + m + 5 = 66 }}}
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(2) {{{ a + m = 56 }}}
Substitute (1) into (2)
(2) {{{ a + 3a = 56 }}}
(2) {{{ 4a = 56 }}}
(2) {{{ a = 14 }}}
and, since
(1) {{{ m = 3a }}}
(1) {{{ m = 3*14 }}}
(1) {{{ m = 42 }}}
Abu is 14
His mother is 42