Question 665871

Given:
{{{A }}}= weight of coffe A at ${{{3.00}}}
{{{B }}}= weight of coffee {{{B = 2.5lb}}} at ${{{4.20}}}
{{{M}}} = weight of the Mixture at ${{{3.75}}}

{{{M = A + B}}}

{{{M = A + 2.5lb}}}.............eq. 1

{{{(3.0)A + (4.2)2.5 = (3.75)M}}}

{{{(3.0)A + 10.5 = (3.75)(A + 2.5)}}}

{{{3A + 10.5 = 3.75A + 9.375}}}

{{{3.75A - 3A = 10.5 - 9.375}}}

{{{0.75A = 1.125}}}

{{{A = 1.125/0.75}}}

{{{A = 1.5lb}}}