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15 1/2% of what is 19

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4 Answers

use the formula percentage=rate X base, or p=r X b, where percentage is the IS number, base is the OF number, and rate is the PERCENT
 
19 = 15 1/2 % X base,  19 = 15.5 % X base,  19 = 0.155 X base,  divide both sides by 0.155 to get
 
19/0.155 = base,  base = 122.58 (rounded off) ,  the base is the unknown, the problem states " ... OF what
 
IS 19 "
Hi Adams;
Thank you for the question.
First, in the equation, we do NOT want to work with %...
15.5%=0.155
Then...
0.155x=19
Finally...
x=19/0.155=122.58
I hope this helps!
 
 
The easiest thing to do is to convert it to a decimal. 15 1/2% = 15.5% =.155
 
Using the equation from your book:
 
.155*B=19
 
B=19/.155=122.58 (Rounded to the nearest hundredth)