Question 731751
Let {{{ a}} = your age in years
Let {{{ b }}} = your daughter's age in years
Let {{{ c }}} = you granddaughter's age in years
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given:
(1) {{{ 365.25c = 52b }}}
(2) {{{ 12c = a }}}
(3) {{{ a + b + c = 100 }}}
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(1) {{{ b = 365.25/52 }}}
(1) {{{ b = 7.024c }}}
By substitution:
(3) {{{ 12c + 7.024c + c = 100 }}}
(3) {{{ 20.024c = 100 }}}
(3) {{{ c = 4.994 }}}
and, since
(1) {{{ b = 7.024c }}}
(1) {{{ b = 7.024*4.994 }}}
(1) {{{ b = 35.078 }}}
and
(2) {{{ 12c = a }}}
(2) {{{ a = 12*4.994 }}}
(2) {{{ a = 59.928 }}}
Your age is 60 yrs
check answer:
(3) {{{ a + b + c = 100 }}}
(3) {{{ 60 + 35 + 5 = 100 }}} ( approximately )
(3) {{{ 100 = 100 }}} 
OK