MathDB
Counting Wheels

Source:

June 4, 2011
algebrasystem of equationsbinomial theorem

Problem Statement

A group of children riding on bicycles and tricycles rode past Billy Bob's house. Billy Bob counted 77 children and 1919 wheels. How many tricycles were there?
<spanclass=′latex−bold′>(A)</span> 2<spanclass=′latex−bold′>(B)</span> 4<spanclass=′latex−bold′>(C)</span> 5<spanclass=′latex−bold′>(D)</span> 6<spanclass=′latex−bold′>(E)</span> 7<span class='latex-bold'>(A)</span>\ 2 \qquad <span class='latex-bold'>(B)</span>\ 4 \qquad <span class='latex-bold'>(C)</span>\ 5 \qquad <span class='latex-bold'>(D)</span>\ 6 \qquad <span class='latex-bold'>(E)</span>\ 7
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