
Solving Word Problems

A  That's items times items PLUS cost times cost. B  That's item plus cost TIMES item plus cost. C  That's items times cost PLUS items times cost. D  That's items plus items TIMES cost plus cost. You WANTED the quantity of the first type of item times the cost of each one PLUS the quantity of the second type of item times the cost of each of them:
 
Sometimes you may find it helpful to actually calculate the answer and then work backwards from the expressions to find the one that yields the same amount.

A  That's 2 hours times 40 mph PLUS 3 hours times 50 mph. B  That's 2 hours times 50 mph PLUS 3 hours times 40 mph. C  That's time (in hours) plus time (in hours) TIMES rate plus rate. D  That's time (in hours) plus rate TIMES time (in hours) plus rate. You WANTED the number of hours traveled at the first rate of speed times the distance per hour PLUS the number of hours traveled at the second rate of speed times the distance per hour:
 
You may sometimes find it helpful to actually calculate the answer for each expression (while keeping in mind what each amount represents); then see which approach "makes sense" in solving the problem.

Solve each problem; to check, 

Answers:
1c (370 miles) 2b ($24 in all) 3a ($60 more) 
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