posted by Fred .
last weekend, I went to play the nearby park. It was real fun! I rode my new bicycle tat Mom had gifted me on my birthday. On reaching the park, I saw that there were a total of 15 bicycles and tricycles. if the total number of wheels was 35, how many tricycles are there?
let the number of bikes be x
then the number of trikes must be 15-x
2x + 3(15-x) = 35