Perportions and percents?

Question

69% of c is 60. what is c?

200% of a is 400. what is a?

what percent of 80 is 32?

Find 80% of 25.

find 44% of 375.

Answer 1

69%of c=60    69/100 = 60/c  69c=6000  c=6000/69= 86.9565

200%of a=400    200/100= 400/a   200a=40000  a=200

% of 80=32   100/x=80/32   80x=3200    x= 40

80% of 25  .80 *25= 20

44%of 375=  375* .44= 165

Answer 2

To find the percent of anything you must multiply:



(the number you need the percentage of) * (part of 1).  

You multiply by a part of one because 1 = 100%.  Therefore 20% would = .20, 45% would be .45, and so on.

Divide 60 by .69 to get c.  You do this because 69% of c would be c times .69.  Therefore:  

c*(.69) = 60

divide both sides by .69

c*(.69)/(.69) = 60/(.69)

c =  86.9565

This second question is saying:

a*(2) = 400

So, divide both sides by 2 to find a

a*(2)/(2) = (400)/(2)

a = 200

This question is asking you:

32*(.80) = x

Therefore, x = 25.6

80% of 25 is the same equation as the last problem.

(The number that you need the percentage of) * (the percentage)

25*(.80) = x

Therefore, x = 20

44% of 375 is still the same equation.

(The number that you need the percentage of) * (the percentage)

375*(.44) = x

Therefore, x = 165