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# 1/3 of people are under 20.if 15 of them are under 20 how many are over 20

Fractions of quantities

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If 15 equals 1/3 of the population then 2/3 will be over 20. Multiply 15 by 2 to equal 30, the 2/3 over 20. Total population counted will be 45 (15 + 30).

Posted on Apr 27, 2015

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## Related Questions:

### How to solve franctions

Multiplying Fractions:
1. Make sure you're working with two fractions.
2. Multiply numerator x numerator, then multiply denominator x denominator.
Dividing Fractions:
1. Make sure you're working with two fractions
2. Flip the second fraction upside down.
4. Multiply top x top and bottom x bottom.
Converting Mixed Numbers into Improper Fractions:
1. Convert mixed numbers into improper fractions.
2. Take the whole (non-fraction) number and multiply it by the denominator.
4. Put that amount over the original denominator and you will have an improper fraction.
Method for Adding and Subtracting Fractions:
1. Find the lowest common denominator (bottom number). For both adding and subtracting fractions, you'll start with the same process.
2. Multiply fractions to match the lowest common denominator.
3. Add or subtract the two numerators (top number) but NOT the denominators.

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### Which is more precise, fractions or decimals??

Fractions can be more precise than decimals. For example: 1/3 can not be expressed exactly as a decimal. .33333333333333333333333333333333333333333... is only an approximation.
Some numbers cannot be expressed precisely as either a fraction or a decimal. pi is an example.

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### Can you do any ratio on the cauculator

Most of the time a ratio is nothing but the division of two quantities. If you have a fraction key, enter one term of the ratio as numerator, and the second term as denominator. If you do not have a fraction key just use the division key.
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### My TI 84 won't convert my imaginary numbers to fractions. I typed in 1/(1+i) and it won't convert the answer to fraction form. It keeps saying Error Data Type

The TI-84 works with real fractions. It will not convert complex numbers to fractions.

You can convert the real and imaginary components to fractions separately. For your example, 1/(1+i) is .5-.5i. Converting .5 and -.5 to fractions, you get 1/2 + (1/2)i.

Sep 15, 2011 | Texas Instruments TI-84 Plus Calculator

### It is showing fractions instead of Decimals when i do equations like (4 divided by 9) it gives 4/9 instead of the decimal.

Calculation results will be displayed using
fractions, r, and ?. When you press CHANGE, the display will cycle
through the following display styles:
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or without ?) ? decimal numbers
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Feb 03, 2011 | Sharp ELW535 Calculator

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A quantity into which all the denominators of a set of fractions may be divided without a remainder.

Jun 28, 2010 | Mathsoft Mathcad Expert Solver Full...

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find the least common denominator between the original fraction into the new fraction.
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Hello.

If your TI has a MATH button, select it.

Under Math, Function 1 is fractions and Function 2 is decimals

For example, 2/3 plus 2/3 ...

2 - / - 3 - + - 2 - / - 3 = 1.33333333
2nd - ANS - MATH - 1 = 4/3

Hope this helps.

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if you are using MS Excel, you can type fractions by typing 0 1/2 instead of typing 1/2 only. All fractions must be preceded by 0 (zero).

Regards!

Jul 04, 2009 | Computers & Internet

### How do i display fractions?

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Oct 29, 2008 | Texas Instruments TI-84 Plus Silver...

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