Book Maths Puzzle Algebra

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

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Book Other Question

simplify the square root of 128 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?