<PRE><B>Question 923711</B>
 Bryan Berg built an 83 story house of cards.
 He used 27,000 playing cards.
 At this same rate, about how many cards would it take to build a 100-story house of cards?
 Round to the nearest whole number.
:
A ratio equation
Let c = no. of cards to build a 100 story house
{{{c/27000}}} = {{{100/83}}}
Cross multiply
83c = 27000 * 100
83c = 2700000
c = 2700000/83 
c = 32,530 cards</PRE>