<PRE><B>Question 947295</B>
Assign variables like v for how many students per van, and b for how many students per bus.


CLASS A:
7v+14b=504



CLASS B:
14v+13b=588


IF you multiply the A equation by 2, then you can form a system,
{{{system(14v+28b=1008,14v+13b=588)}}}
perfectly set for eliminating the v terms and quickly finding value for b.</PRE>