Question 1107710
Let {{{ a }}} = pounds of nuts needed
Let {{{ b }}} = pounds of raisins needed
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(1) {{{ a + b = 150 }}}
(2) {{{ ( 6a + 3b ) / 150 = 4 }}}
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(2) {{{ 6a + 3b = 4*150 }}}
(2) {{{ 6a + 3b = 600 }}}
(2) {{{ 2a + b = 200 }}}
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Subtract (1) from (2)
(2) {{{ 2a + b = 200 }}}
(1) {{{ -a - b = -150 }}}
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{{{ a = 50 }}}
and
{{{ 50 + b = 150 }}}
{{{ b = 100 }}}
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50 pounds of nuts and 100 pounds of raisins are needed