Sara went to the park and saw that there were a total of 15 bicycles and tricycles. If the total number of wheels was 39, how many tricycles were there?
bi = 2 wheels
tri = 3 wheels
Please help me, I'm really struggling with this problem
I don't remember the easiest way to do this -- so I tried trial and error.
6 bikes and 9 trikes
15 x 6 = 30 wheels
3 x 9 = + 9 wheels
________________________
12 39
am i correct????
btw --- what's trial and error???? I don't remember learning this last year.
I don't understand your arithmetic above. I gave you the answer.
Trial and error means trying different combinations of numbers until you find the answer.
6 bikes = 12 wheels
9 trikes = 27 wheels
Thank You! :)
Sure! Let's break down the problem step by step.
1. Let's represent the number of bicycles as "b" and the number of tricycles as "t."
2. We know that the total number of bicycles and tricycles is 15, so we can write the equation: b + t = 15.
3. We also know that the total number of wheels is 39, and each bicycle has 2 wheels while each tricycle has 3 wheels. So we can write the equation: 2b + 3t = 39.
Now, we can solve this system of equations to find the values of "b" and "t."
First, let's solve the first equation (b + t = 15) for "b." We can subtract "t" from both sides of the equation:
b = 15 - t.
Next, we substitute this expression for "b" into the second equation (2b + 3t = 39):
2(15 - t) + 3t = 39.
Now, we can simplify and solve for "t":
30 - 2t + 3t = 39,
30 + t = 39,
t = 39 - 30,
t = 9.
Therefore, there are 9 tricycles.