<PRE><B>Question 1126233</B>
Let {{{ a }}} = ounces of 3% c.b. ink
Let {{{ b }}} = ounces of 275 c.b ink
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(1) {{{ a + b = 384 }}}
(2) {{{ ( .03a + .27b )/ 384 = .15 }}}
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Multiply both sides of (1) by {{{3}}}
and subtract from (2)
(2) {{{ .03a + .27b = 57.6 }}}
(2) {{{ 3a + 27b = 5760 }}}
(1) {{{ -3a - 3b = -1152 }}}
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{{{ 24b = 4608 }}}
{{{ b = 192 }}}
and
(1) {{{ a + 192 = 384 }}}
(1) {{{ a = 192 }}}
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192 ounces of each are needed
check:
(2) {{{ .03*192 + .27*192 = 57.6 }}}
(2) {{{ 192*.3 = 57.6 }}}
(2) {{{ 57.6 = 57.6 }}}
OK
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