Question

1.Buena Vista high school has five times as many black and white monitors as colored monitors. The school has 40 black and white monitors for computers. How many color monitors does the school have?

2.A hardcover book sells for $16.50. The same title and paperback sells for $4.95. How many hardcover books must a dealer sell to take in as much money as he/she does for 30 paperback copies?

3. A police helicopter clocked a truck over a stretch of highway 1/5 mile long. The truck traveled the distance and 10 seconds. At what rate was a truck traveling in mi/sec? At what rate was it traveling in mi/h?

Answer 1

1) colored monitors=c   B/W monitors=5c
5c=40
c=40/5
c=8 colored monitors

2)$4.95(30)=16.95(x)
$148.50=16.95x
8.7610=x
since the store cannot sell 0.7610 of a book, round up to the next whole number
9 hardcover books must be sold

3)1/5 mi/10 sec= 0.02 mi/sec
0.02mi x 3600 sec = (0.02)(3600) mi = 72mi/hr
 1 sec        1 hr                 1 hr
**in the conversion, the seconds unit cancels out