Question 1088348
(1) {{{ s = 4j }}}
(2) {{{ j = e + 3 }}}
(3) {{{ s + j + e = 57 }}}
------------------------
There are 3 unknowns and 3 equations,
so the problem is solvable
(2) {{{ e = j - 3 }}}
Plug (1) and (2) into (3)
(3) {{{ 4j + j + j - 3 = 57 }}}
(3) {{{ 6j = 60 }}}
(3) {{{ j = 10 }}}
and
(1) {{{ s = 4j }}}
(1) {{{ s = 40 }}}
and
(2) {{{ e = j - 3 }}}
(2) {{{ e = 10 - 3 }}}
(2) {{{ e = 7 }}}
Shania is 40
Jenny is 10
Enrique is 7 
----------------
check:
(3) {{{ s + j + e = 57 }}}
(3) {{{ 40 + 10 + 7 = 57 }}}
(3) {{{ 57 = 57 }}}
OK