Book Maths Puzzle Algebra

If the compliment of an angle is one tenth the supplement of the angle than what is the measure of the angle? I am unsure where to start.....

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Book Other Question

GROUND CHECK SELLS FOR $1.75 LB. HOW MANY POUNDS OF GROUND ROUND SELLING FOR $2.45 LB SHOULD BE MIXED WITH 20 LBS OF GROUND CHUCK TO OBTAIN A MIXTURE THAT SELLS FOR $2.05 LB. CAN YOU PLEASE EXPLAIN TO ME HOW TO WORK THIS PROBLEM? The Brown Family wants to carpet their livig room, which is 13 ft. by 16 ft. They want a border of uniform width of wood floor to show around the carpet. How wide should the border be if they can afford to carpet only 108 sq. ft?

Please tell me in steps how to solve this.

Thanks