Book Maths Puzzle Algebra

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?

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Book Other Question

When you have a word problem that is dealing with fractions, how do you know, if you should add, subtract, divide or multily? 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.....