book Maths Puzzle Numerical Ability

Please help me solve this:

2b+a=11
a-b=5

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book Other Question

The angular velocity of a tire is 25 radians/second. find the linear velocity of a tack stuck in the tread of the tire if the diameter of the tire is 2 feet. is 2.040506 a rational or irrational number?
I think that it is a irrational number. is this right?