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Dominik [7]
3 years ago
7

25% of what number is 21?

Mathematics
2 answers:
BaLLatris [955]3 years ago
7 0
Let the unknown number be x.

25% of x is 21

25% * x = 21

0.25 * x = 21

0.25x = 21

0.25x/0.25 = 21/0.25

x = 84

Answer: The number is 84.
Tcecarenko [31]3 years ago
5 0
Hey there! :D

25% represents a quarter of a number. 

If 21 is a quarter of a number, multiply it by 4. 

21*4= 84

21 is 25% of 84. 

I hope this helps!
~kaikers
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Step-by-step explanation:

There's a lot of information here, so first things first, let's get organized.

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FSD = 31

Sticking to this naming scheme:

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a) We want to know how many seniors there are.  So all we have to do is add up all the variables with an S in them.

FSD + MSD + FS + MS

31 + 45 + 87 + 96

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b) We want to know how many women there are.  So add up all the variables with an F in them.

FSD + FD + FS + F

31 + 62 + 87 + 275

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c) We want to know how many are on the dean's list.  So add up all the variables with a D in them.

FSD + FD + MSD + MD

31 + 62 + 45 + 88

226

d) Now we want to know how many are seniors AND on the dean's list.  So add up all the variables that have both an S and a D.

FSD + MSD

31 + 45

76

e) We want to know how many female seniors there are, so add up all the variables with both an F and an S.

FSD + FS

31 + 87

118

f) We want to know how many women were on the dean's list, so add up all the variables with both an F and a D.

FSD + FD

31 + 62

93

g) Finally, we want to know how many students there are total.  So add up all the variables.

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