Question 995473
Let {{{ u }}} = units digit
Let {{{ t }}} = tens digit
Let {{{ h }}} = hundreds digit
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given:
(1) {{{ t = 3u }}}
(2) {{{ h = 4u }}}
(3) {{{ u + t + h = 16 }}}
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Substitute (1) and (2) into (3)
(3) {{{ u +  3u + 4u = 16 }}}
(3) {{{ 8u = 16 }}}
(3) {{{ u = 2 }}}
and
(1) {{{ t = 3u }}}
(1) {{{ t = 3*2 }}}
(1) {{{ t = 6 }}}
and
(2) {{{ h = 4u }}}
(2) {{{ h = 4*2 }}}
(2) {{{ h = 8 }}}
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The number is:
862