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can someone explain to me how to solve this math problem?
"During a quality control check,a facotry found that 5% of the parts it produces are defective.The factory recently completed an order for 144,000 parts.
Aproximately how many parts from the order may be defective?"
5 Answers
- Anonymous8 years ago
Get a ruler in your hands. Measure things until you start to understand how a ruler works. Measure some stuff and figure out where the center is. Say you measure a book and it's 7/8" thick. You look at your ruler and see that every eighth is divided into two sixteenths, so obviously half of 7/8" is going to be 7/16". If you write that out you have 1/2 x 7/8 = 7/16. And you notice that 1/2 is divided into 2/4 and then into 4/8 and so on, so you can convert anything to anything by multiplying all the numbers on top and then all the numbers on bottom.
Other rulers are divided into 10 and 100 parts. But an inch is still and inch, so anything on one ruler can be translated to the other ruler. A half inch on one ruler is 5/10 or 50/100 on the other. An eighth inch is just 12.5 marks when you have 100 marks per inch. A metric ruler divides an inch into 25.4 parts, so a half inch would be 12.7 of those parts. Pretty simple, isn't it? Practice this a bit and people will think you went to wizard school.
Percent is simply a ruler with 100 marks. You are given that 100 marks are worth 144,000 so each mark is worth 1440 and 5 marks are worth 7200.
- 8 years ago
You could just multiply .05 by 144,000. It comes out to 720. That's usually how I figured out percentages.
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