The number 155 can be written as the sum of the squares of 3 different positive integers. What is the sum of these 3 integers?
Choose one:  A) 17  B) 16  C) 15  D) 14  E) 21
7^2+5^2+9^2=49+25+81= 
<gadget id="calculator">49+25+81</gadget>
<output>155</output>
155   7+5+9= 
<gadget id="calculator">7+5+9</gadget>
<output>21</output>
21   Hence answer is 21
<result>E</result>
The number 155 can be written as the sum of the squares of 3 different positive integers. What is the sum of these 3 integers?