+0  
 
0
249
1
avatar

At billy's school they have some bikes and some trikes with a total of 57 wheels. the number of bikes is three less than three times the number if trikes. How many bikes and trikes are there?

Guest Feb 27, 2015

Best Answer 

 #1
avatar+26973 
+5

b = number of bikes,  t = number of trikes

 

2*b + 3*t = 57       wheels

b = 3*t - 3          

 

Substitute the 2nd equation into the first

2*(3*t - 3) + 3*t = 57 or

9t - 6 = 57 or

9t = 63  or

t = 7

 

Put this back into the 2nd equation;

b = 3*7 - 3 or

b = 18

 

So, in total: b + t = 25

.

Alan  Feb 27, 2015
 #1
avatar+26973 
+5
Best Answer

b = number of bikes,  t = number of trikes

 

2*b + 3*t = 57       wheels

b = 3*t - 3          

 

Substitute the 2nd equation into the first

2*(3*t - 3) + 3*t = 57 or

9t - 6 = 57 or

9t = 63  or

t = 7

 

Put this back into the 2nd equation;

b = 3*7 - 3 or

b = 18

 

So, in total: b + t = 25

.

Alan  Feb 27, 2015

32 Online Users

avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.