+0  
 
0
81
2
avatar

You took a test. The test was worth 114 points. There were 30 questions on the test. If questions were worth either 2 or 5 points each, how many 2-point questions were there on the test? How many 5-point questions were on the test?

 Mar 28, 2021
 #1
avatar
0

We can set up we have 2 variables for this problem. 

 

x = # of 5 point questions

y = # of 2 point questions

 

Since we have 2 variables, we need 2 equations, and we have those equations.

 

We know that...

\(x + y = 30\)

\(5x + 2y = 114\)

 

To solve, we first have to make it a one variable equation.

Since \(x = 30 - y\), we can replace all of the \(y\) with \(30 - x\).

 

So \(5x + 2y = 114\) changes to \(5x + 2(30-x) = 114\)

 

\(5x + 2(30-x) = 114\)

\(5x + 60 - 2x = 114\)

\(3x + 60 = 114\)

\(3x = 54\)

\(x = 18\)

 

So...

\(y = 12\)

 

Your answer is...

There are 18 5 point questions and 12 2 point questions.

 

And you are done! :)

 Mar 28, 2021
 #2
avatar+33815 
+1

x = 5 pt questions

30 -x   =  2 point questions

 

5x   +    2 ( 30 - x) = 114

3x = 54

x = 18     5-pointers     then  12     2-pointers        

 Mar 28, 2021

21 Online Users

avatar
avatar