Question 986358
a pounds of type A
b pounds of type B
{{{a/b=2}}}


ACCOUNT FOR COST
{{{5.95a+7b=56.7}}}


Substitute for either variable from the given ratio; here choosing a=2b:
{{{5.95(2b)+7b=56.7}}}
{{{(11.9+7)b=56.7}}}
{{{b=56.7/(18.9)}}}
{{{highlight(b=3)}}}