Question 1095027
Let {{{ b }}} = Bob's amount
Let {{{ f }}} = Fred's amount
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(1) {{{ f = b + 120 }}}
(2) {{{ f - 20 = 6b }}}
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(2) {{{ f = 6b + 20 }}}
Plug (2) into (1)
(1) {{{ 6b + 20 = b + 120 }}}
(1) {{{ 5b = 100 }}}
(1) {{{ b = 20 }}}
and
(1) {{{ f = b + 120 }}}
(1) {{{ f = 20 + 120 }}}
(1) {{{ f = 140 }}}
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Bob has $20
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check:
(2) {{{ f - 20 = 6b }}}
(2) {{{ 140 - 20 = 6*20 }}}
(2) {{{ 120 = 120 }}}
OK