Question 681716
if r planes can carry p passengers, how many planes are needed to carry m passengers
<pre>
Since r planes can carry p passengers, m×r planes can carry m×p passengers,
so to carry only m passengers (which is m×p passengers divided by p), we'd
need only (m×r planes divided by p) planes.

Answer {{{(m*r)/p}}} planes:


Or you can do it this way:

r is to p as x is to m

{{{r/p}}}{{{""=""}}}{{{x/m}}}

px = mr

{{{p*x/p}}}{{{""=""}}}{{{m*r/p}}}

{{{cross(p)*x/cross(p)}}}{{{""=""}}}{{{m*r/p}}}

x = {{{m*r/p}}}


    

Edwin</pre>