Question 991927
A recipe calls for 3 1/2 cups of flour, and 3/4 cups of sugar.
If you want to make the recipe with 6 cups of flour, how much
sugar will you need?
<pre>
{{{matrix(1,4,3&1/2,cups,of,flour)/matrix(1,4,3/4,cups,of,sugar)}}}{{{""=""}}}{{{matrix(1,4,6[""],cups,of,flour)/matrix(1,4,N,cups,of,sugar)^""}}}

{{{matrix(1,1,3&1/2)/matrix(1,1,3/4)}}}{{{""=""}}}{{{matrix(1,1,6[""])/matrix(1,1,N)^""}}}

Cross multiply:

{{{3&1/2*N}}}{{{""=""}}}{{{expr(3/4)*6}}}

{{{expr(7/2)*N}}}{{{""=""}}}{{{9/2}}}

Multiply both sides by 2

{{{7*N}}}{{{""=""}}}{{{9}}}

Divide both side by 7

{{{N}}}{{{""=""}}}{{{9/7}}}

{{{N}}}{{{""=""}}}{{{matrix(1,4,1&2/7,cups,of,sugar)}}}

Edwin</pre>