Question 1015251
Let {{{ L }}} = Loli's age now
Let {{{ P }}} = Pop's age now
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(1) {{{ L = P + 20 }}}
(2) {{{ L + 10 = 2*( P + 10 ) }}}
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Substitute (1) into (2)
(2) {{{ P + 20 + 10 = 2*( P + 10 ) }}}
(2) {{{ P + 30 = 2P + 20 }}}
(2) {{{ P = 10 }}}
and
(1) {{{ L = P + 20 }}}
(1) {{{ L = 10 + 20 }}}
(1) {{{ L = 30 }}}
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Loli is 30 now
Pop is 10 now
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check:
(2) {{{ L + 10 = 2*( P + 10 ) }}}
(2) {{{ 30 + 10 = 2*( 10 + 10 ) }}}
(2) {{{ 40 = 2*20 }}}
(2) {{{ 40 = 40 }}}
OK