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September 18, 2014

September 18, 2014

Posted by **Alex** on Tuesday, October 8, 2013 at 11:15pm.

1. 50 students got pizza at lunch. 20% of those got chocolate milk. How many students got chocolate milk?

50/n = 20/100

20n = 100*50

20n = 5000

n = 5000/20

n = 250 students

2. Mr. Ford has 45 fish in his aquarium. What is the number of blue fish if 40% of the fish are blue?

n/45 = 40/100

100n = 45*40

100n = 1800

n = 1800/100

n = 18 fish

3. In a survey 30 out of 40 people said they like carving pumpkins during all season. What is the percent of people who like to carve pumpkins?

30/40 = p/100

40p = 30*100

40p = 3000

p = 3000/40

p = 75%

4. In a dog park, 80% of the dogs were on leashes. If 20 dogs were on leashes, then how many dogs were in the park?

20/d = 80/100

80d = 20*100

80d = 2000

d = 2000/80

d = 25 dogs

Unit Rate/Ratios

1. Mr. Santana was buying some candy for his classes. When he went to buy some Crunch bars, he found 2 different packages:

3.6 oz for $1

11.5 oz for $2.50

Which is the better buy?

Answer: seems like it would 11.5oz because getting more in the bag. But, not sure how to put this is in a proportion.

- 6th grade math -
**Jai**, Tuesday, October 8, 2013 at 11:24pm1. You have to just multiply them, because it says 20% of those 50 students got milk, so

50 * 0.2 = 10 students

2. Yep

3. Yep

4. Yep

5. [Unit ratio]

What we'll do here is to get the cost per oz. Thus we divide $1 by 3.6 oz and $2.50 by 11.5 oz, then compare.

$1/3.6 = $0.278 / oz

$2.5/11.5 = $0.217 / oz

Thus the second option is better.

Hope this helps~ :3

- 6th grade math -
**Alex**, Tuesday, October 8, 2013 at 11:36pmThanks!! Yes, this helps.

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