Find time spend watching space movies if....

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santasad13

Junior Member
Joined
Jan 26, 2006
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My teacher wants a variable on both sides of the equation.

Find the amount of time Joel spent waching space movies if:

1) he saw two times as many 1.5-hour space movies as he did 2-hr mystery movies, and
2) the total time he spent watching movies was 15 hours.

Code: 
          | movie  | number of | total |
          | length |   movies  | time  |
|---------|--------|-----------|-------|
|  space  |        |           |       |
|---------|--------|-----------|-------|
| mystery |        |           |       |
|---------|--------|-----------|-------|
 
What have you tried? How far have you gotten? Where are you stuck?

For instance, you picked a variable for the number of mystery movies watched. What was it? What expression did you create, in terms of this variable, for the number of space movies watched? You filled in the "movie" length column with "1.5" and "2", and... then what?

Please be specific. Thank you.

Eliz.
 
I had a variable, m , for movie, but I can't figure out how to get the propblem set up. Once I can figure that out, I can do the rest.
 
The point of this exercise is that you do the translation. If we translate and set up for, that would miss the point. So please show your work and reasoning. For instance, surely you can figure out how to fill the first column of the chart...?

For the second column, what does "m" stand for? Given that he watched two times as many space movies as mystery movies, what expression would stand for the number of space movies?

The third column is the products of the entries in the first and second columns. What did you get for these column entries?

Once you have (sub-)totals of hours for each type of movie, how would you express the total hours for both together? What (numerical) total value were you given? What equation does this give you?

Thank you.

Eliz.
 
Is this right?

Code: 
          | movie  | number of | total  |
          | length |   movies  | time   |
|---------|--------|-----------|--------|
|  space  |  1.5   |    2m     | 1.5*2m |
|---------|--------|-----------|--------|
| mystery |   2    |     m     |   2m   |
|---------|--------|-----------|--------|
If so, does that mean that the following is my equation?

3m + 2m = 15
5m = 15
m = 5

...and the time he watched space movies 10 hours?
 
If "m" stands for "the number of mystery movies watched", then the set-up is correct.

But you might want to check your math. If 5m equals 15, then m is not equal to five.

Also, check your interpretation. What does "m" stand for? So what does the value of m represent with respect to the original question? (If "m = 5" means "he watched five hours of mystery movies", then, since the mysteries were two hours long, he must have watched two and a half movies, which doesn't make much sense.)

Eliz.
 
Code: 
          | movie  | number of | total | 
          | length |   movies  | time  | 
|---------|--------|-----------|-------| 
|  space  |  1.5   |     6     |   9   |
|---------|--------|-----------|-------| 
| mystery |   2    |     3     |   6   | 
|---------|--------|-----------|-------|
Is that the correct answer?
 
Ho ho ho, yes Santa, that's correct.

Fyi, can be done quite simply:

x = number of 2hr movies; then 2x = number of 1.5hr movies; so:
2(x) + 1.5(2x) = 15
2x + 3x = 15
5x = 15
x = 3

2*3 = 6
15 - 6 = 9
 
1. Star treck
2. The fifth element
3. Rear Window (1954)
4. Psycho (1960)
5. The Usual Suspects (1995)


These are the top movies that take place in outer space and mystery movies they're all good.
 
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