SOLUTION: 12.on a man 1 1/2 inches represent 45 miles. If two cities are 5 inches apart on a map, how far are they in reality? I mutiplied 45 times 5 and got 225 miles is this right? 13.

Algebra ->  Customizable Word Problem Solvers  -> Misc -> SOLUTION: 12.on a man 1 1/2 inches represent 45 miles. If two cities are 5 inches apart on a map, how far are they in reality? I mutiplied 45 times 5 and got 225 miles is this right? 13.      Log On

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Question 118588This question is from textbook Basic Mathematics
: 12.on a man 1 1/2 inches represent 45 miles. If two cities are 5 inches apart on a map, how far are they in reality? I mutiplied 45 times 5 and got 225 miles is this right?
13. A quality control inspector examined 42 light bulbs and found 7 defective. At this rate, how many defective bulbs will there be in a lot of 2682? I divided 2682 by 7 and got 383.
14. It takes Bob 30 minutes to type three-fourths of a page of his term paper. At this rate, how long will it take to type a 6 page paper? I multiplied 30 by 6 and divided that answer by 4 and got 240.
15. A train traveled 264 miles in 6 hours. At this rate, how far will it travel in 11 hours? I multiplied 264 by 11 and got 2904 miles.
thanks very much
This question is from textbook Basic Mathematics

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
12. This is a ratio problem
a%2Fb+=+c%2Fd
In this problem, 1.5%2F45+=+5%2Fx
multiply both sides by 45x
1.5x+=+5%2A45
x+=+225%2F1.5
x+=+150mi answer
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13. This is another ratio problem
7%2F42+=+x%2F2682
1%2F6+=+x%2F2682
multiply both sides by 6
1+=+x%2F447
x+=+447defective answer
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14. Also a ratio
30%2F.75+=+x%2F6
multiply both sides by .75%2A6
30%2A6+=+.75x
x+=+180+%2F+.75
x+=+240minutes which is the same as
240%2F60+=+4hours answer
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15. This can be thought of as a ratio, or use the formula
d+=+r%2At I'll use the formula
t+=+11hrs
r+=+264%2F6mi/hr
d+=+11%2A%28264%2F6%29
d+=+11%2A44
d+=+484mi answer
You could have come up with a ballpark number just by saying
"11 hours is almost twice 6 hours. The train would travel
almost twice as far, or just under 528 mi."