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Wittaler [7]
3 years ago
14

I need a easy way to do percentage

Mathematics
1 answer:
o-na [289]3 years ago
7 0
It depends on what you are trying to calculate but the most common way I go to find percentage is to multiply by the number in decimal for ie. 50% = .5.

If you are looking for a way to do it quickly in your head I always take find out what 10% is like in the case of 100 it would be 10 so if I want to find 15% I know I can find 10% and if I cut what 10% is in half I will find 5% so likewise if I add what 10%+5% I will end up with 15%. For example, 10% of 100 is 10 half of 10 is 5 and 10+5 equals 15. If you need to find something like 20% or 30% I know that I can find 10% and instead of dividing(cutting it in half) I can multiply by 2 or 3. 10% + 10% =20%

I hope it helps, if you have more questions let me know!
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The heights of male students are normally distributed with a mean of 160 cm and a standard deviation
kompoz [17]

Answer:

2.28%

Step-by-step explanation:

As this is normally distributed, we can use z scores to find the percentage.

First, find the z-score for 148.

The z-score that you get is:

(148-160)/2=2

As we see that z=2, we can use a calculator or a z-score chart to find the percentage less than a z score of 2.

I used my chart and found: 2.28%

4 0
2 years ago
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Find all ratios that are equivalent to 4 : 6 and have a first term that is less than 40.
kherson [118]

Answer:

2: 3, 4: 6, 6: 9, 8: 12 , 10: 15, 12: 18, 14: 21, 16: 24, 18: 27, 20: 30, 22: 33, 24:36, 26: 39, 28: 42, 30: 45, 32: 48, 34: 51, 36: 54, 38: 57

Step-by-step explanation:

The ratio 4: 6 can be simplified to 2:3 by dividing by 2 to each side of the ratio. After simplified to 2:3, you add the ration to itself to get the rest of the terms.

7 0
3 years ago
CDEF is a kite and m
blagie [28]

m < 3 = 90 - 46 = 44 degrees answer.

7 0
3 years ago
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Write a real world situation that could be modeled be the equation 120 + 25x =45x
Savatey [412]
Is renting a car
company A charges $120 plus 25 dollars per day

company B charges 45 dollars per day

at how many days will the costs be equal

120+25x
x=days
45x

120+25x=45x
subtract 25x from btoh sdies
120=20x
divide both sdie sb 20
6=x

the answer is 6 days
4 0
3 years ago
Cross multiplication;<br><br> 2/3 5/6<br><br> Do u just multiply 6 and 2, &amp; 3 and 5????
seraphim [82]

Answer:

2 \div 3 \times 5 \div 6 \:  = 10 \div 18

We just have to multiply not cross multiply,

10/18

Now, divide the equation

5/9 will be ur answer

3 0
2 years ago
Read 2 more answers
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