book Maths Puzzle Numerical Ability

CAN SOMEONE FIND The answer to 6y-(3y+9)=17

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At Jefferson High School there are 1200 students. Four percent of the students wear one ring. Of the other 96%, half wear two rings and half wear no rings. What percent of the students wear rings?

thanks for helping me! A flag pole 20 feet high casts a shadow of 5 feet. At the same time, a nearby building casts a 20-foot shadow. How many feet high is the building? ( the ground is level and both the building and the flagpole are perpendicular to the ground)