SOLUTION: Please help me solve this linear equation problem !!! A teacher gives out a test 0f 30 problems. Each computation problem is worth 3 points.Each word problem is worth 5 points.

Question 187302: Please help me solve this linear equation problem !!!
A teacher gives out a test 0f 30 problems. Each computation problem is worth 3 points.Each word problem is worth 5 points. The total of points you can receive on the test is 110 points. How many computation problem are there?
Answer by dukesmart(20) (Show Source): You can put this solution on YOUR website!
Put x= number of tests of computation problems
Put y= number of tests of word problems
we create the 2 equations as follows:

x + y = 30..........(1)
3x + 5y = 110.......(2)
multiply (1) to 3 then (1) will become 3x + 3y = 90 .....(3)
take (2) subtract (3) we have:
3x-3x+5y-3y=110-90
2y = 20
y =10
then x=30-10
x=20
answers: we have 20 computation problems .

RELATED QUESTIONS
Please help me solve this linear equation problem !!! A teacher gives out a test 0f 30 (answered by feliz1965)

Our teacher never showed us how to work out a problem like this so I am confused. Can you (answered by ewatrrr)

PLEASE HELP! This is my question; You are about to take a test that contains... (answered by solver91311)

I need help solving this word problem we are to use a system of linear equations to solve (answered by richwmiller)

Please help me figure out this problem: 8-3(p-4)=2p Thank you! This is a problem that... (answered by stanbon)

Good Evening: The problem is a simple one, however my teacher is showing a method to... (answered by neatmath)

Hello, I am having a problem finding the equation for a hyperbola. I have tried to work... (answered by lwsshak3)

You are about to take a test that contains computation problems worth 4 points each and... (answered by ankor@dixie-net.com)

Please help me solve this equauation. Solve each problems 19. The current in (answered by uma)