Question 269713
(1) {{{f + s + r = 550}}}
(2) {{{f = 2s}}}
(3) {{{s = (3/2)*r}}}
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From (3)
{{{r = (2/3)*s}}}
By substitution:
(1) {{{f + s + r = 550}}}
{{{2s + s + (2/3)*s = 550}}}
{{{3s + (2/3)*s = 550}}}
{{{9s + 2s = 1650}}}
{{{11s = 1650}}}
{{{s = 150}}}
And, since
(2) {{{f = 2s}}}
{{{f = 2*150}}}
{{{f = 300}}}
There is 300 g of flour
check:
{{{r = (2/3)*s}}}
{{{r = (2/3)*150}}}
{{{r = 100}}}
and
(1) {{{f + s + r = 550}}}
{{{300 + 150 + 100 = 550}}}
{{{550 = 550}}}
OK