let x be the weight of a Mudslinger tire and y be the weight of a Roadtripper tire.
Then ,according to first condition

And according to second condition :-

So the system of equations is :-

In order to solve the given system multiply second equation by 3 and subtract it from first equation which gives:-

Onj substituting x=20 in second equation we get:-

So weight of a Mudslinger tire is 20 pounds and weight of a Roadtripper tire is 22 pounds.