Question

Last weekend, I went to play in the nearby park. It was real fun! I rode my new bicycle that Mom had gifted me on my birthday. On reaching the park, I saw that there were a total of 8 bicycles and tricycles. If the total number of wheels was 20, how many tricycles were there?

Answer 1

Let x = bikes and Y = trikes.

X + Y = 8

X = 8 - Y

2X + 3Y = 20

Substitute 8-Y for X.

2(8-Y) + 3Y = 20

16 - 2Y + 3Y = 20

Y = 4

I hope this helps. Thanks for asking.